Huanggang 2017 high two period physics test

Candidates Note:

1. This paper is divided into paragraphs Ⅰ and Ⅱ, Volume I is a choice, and Volume II is a non-choice question.

2. This paper is full of 100 points and the exam time is 90 minutes.

3. Please fill in the answers to the answer volume corresponding position, the exam is over, candidates only hand in the answer book.

Volume Ⅰ (total 40 points for the selected question)

First, a total of 10 small questions, each small topic 4 points. In each of the four options given in the question, there is only one item that meets the title of the question, and the 7th to 10th question has a number of items that meet the requirements of the topic. All the pairs of 4 points, choose the right but not the total of 2 points, the wrong choice or not to

1. About the electric field intensity, magnetic induction, the following statement is correct

A The direction of the electric field strength is the direction of the electric field force of the test charge at the place.

B The direction of the magnetic induction is the direction of the field force of the energized conductors placed there.

C by E=$\frac{f}{l}$, if the test charge is not affected by the electric field force, there must be no electric field here

D by B=$\frac{f}{il}$, if a small part of the energized conductor is not subjected to magnetic field force, it is stated that there must be no magnetic field here.

2., the power supply electromotive force is E, the internal resistance is R, the DC motor M resistance is R, when the motor is working normally, the ideal voltmeter reading is U, then the current through the motor is

A $\frac{e}{r+r}$

B $\frac{u}{r}$

C $\frac{e (r+r)}{rr}$

D $\frac{e-u}{r}$

3. In the first quadrant of theXOy coordinate system, a uniform magnetic field with a direction perpendicular to the paper and a magnetic flux density of B is applied, and the two particles, equal to the load, are perpendicular to the y -axis from point a , respectively, with the size v 1, the initial velocity of thev2 into the magnetic field, a particle through time T1 from O burst out of the magnetic field, b particles through the time T2 from the x axis of the b point along with X the axis is in the direction of the 60° angle to shoot the magnetic field, regardless of particle gravity and the interaction between particles, the following statement is correct

A v1:v2=1:4

B v1:v2=$\sqrt{3}$:4

C T1:t2=6:1

D T1:t2=2:1

4.a,B is the distribution of the electric field around two equal-point charges in the vacuum (the direction of the electric field line is not marked). The O point is the midpoint of the two-point charge line, andPandQ are two points on the two-point charge cable M,N is two points on the perpendicular bisector of two-point charge,AQ=BP,OM=on. The following statements are correct

A The electric field strength of P,Q two points must be equal

B The potential of the PandQ two points must be equal

C The electric field strength of M Point is greater than that of O Point

D The same point of charge moving from M to P is equal to the power shift from N to Q electric Field Force

5. The area width of the uniform magnetic field perpendicular to the paper direction is a,t= 0 o'clock, the isosceles of the $\sqrt{2}$a is always the corner length right triangle the lead frame ABC starts at the diagram position with the horizontal to the left speed v uniform through the magnetic field, if the counter-clockwise direction is the positive direction of the current, The following description of the lead frame in the relationship between the induction and time T image is correct

6., the metal bar ab resistance R is placed on the horizontal metal guide cdef , Rod ab and the guide rail perpendicular and good contact, the two rail spacing is L, the resistance does not count. The de has an indirect power supply, the power electromotive force is E, and the internal resistance is R. The first time in the diagram is applied in the direction of oblique to the left and the guide plane into θ angle of the uniform magnetic field, a, the second time in the picture is applied to the right and the guide plane into The uniform magnetic field of θ angle, B, two times the intensity of the magnetic field is B, two rod ab are stationary. The following statements are correct

A The ampere force size of bar ab in both graphs is $\frac{bel}{r+r} $cosθ

B The rod AB in the two graphs is in the same direction as the Ampere force

C The friction force of Rod AB in both graphs is $\frac{bel}{r+r} $sinθ

D The support force of Rod AB in a chart may be zero

7., the Uniform electric field E in the direction of vertical downward, horizontal leveling strong magnetic field B vertical paper,a,b is two charged oil droplets. It is known that a is at rest,b is made uniform circular motions in paper, the trace inb is shown in the dotted line, ignoring the electrostatic force between the oil droplets, the following statement is correct

A a,b with the same charge

B a,b quality must be equal

C The Benelux of aandB must be the same

D b move in a counterclockwise direction

8. The cyclotron consists of two copper semi-circular D -shaped metal boxes d1,D2, in which there is a gap between the gap and AC power. D -shaped box in the uniform magnetic field, the direction of the magnetic field perpendicular to the bottom of the box, the center of the box near the particle source, if the particle source of the particle with charge of the amount of Q, the mass of m, the maximum radius of rotation of the particle R, the following statement is correct

A Particles get energy from the magnetic field.

B Particles get energy from an electric field.

C Cycle T=$\frac{πm}{qb}$ of alternating current

D The kinetic energy of the particle fly-out accelerator is ek=$\frac{q^2b^2r^2}{2m}$

9. In the circuit,E is the power supply, the internal resistance is R, V is the ideal voltmeter, L is the resistance constant 2r Small bulb, the value resistor r1 resistance is R,A, B at both ends of a capacitor, the capacitor bipolar plate in the horizontal, closed switch s, a live oil drop P in the center of the capacitor at a standstill state. Slide the rheostat's contact head up, the following statement is correct

A. The voltmeter shows a larger number of meters

B. Small bulbs consume less power

C. Oil drop P to move down the plate

D. The power of the inter-AB circuit becomes progressively larger

10. The smooth insulating water level ABCD is placed on three charged balls a,B,C, which can be regarded as point charges, the connection between them constitutes a isosceles triangle with a vertex angle of θ , known AB,AC side length is a, static power constant is K, the ball a charged amount of Q. Now horizontal plane plus perpendicular to BC Point a Uniform electric field, the three balls are in a stationary state. The following statements are correct

A.a ball may be positively charged or negatively charged

B. Three the quality of the ball can be different

C.θ is preferable to any value between 0~90°

D.E=$\frac{kq}{a^2} $cos $\frac{θ}{2}$

Volume Ⅱ (60 points for non-choice questions)

Two The topic includes 2 small questions, a total of 15 points. Answer when you need to fill in the answers in the corresponding location or according to the title requirements of the drawing, do not have to write the calculation steps.

11. (6 points) An experimental team investigates the mapping of a diode forward-volt characteristic curve.

(1) The identification of the diode shell is blurred, the students first will be a multi-use electric meter selector switch to the Ohmmeter "x10" file, the red and black pen short, that is, the Ohm 0, with a red pen contact the left side of the diode, the black pen contact the right end of the diode, Ohm is shown in a number of indicators, the When the switch pen is measured again, the Ohm is indicated by the number B, which can be judged (fill "left" or "right") end as the cathode of the diode.

(2) Four students design the circuit shown in, wherein the voltmeter resistance is very large, MA table the internal resistance of about 20 Ω, then the correct experimental circuit is

(3) After the correct circuit is selected, the measured diode forward volt-ampere characteristic curve is shown in the test, the higher the forward voltage of the diode, the Resistance value (the larger the fill "or" the smaller ")

12. (9 points) in the "determination of the electromotive force and internal resistance of the battery" in the experiment, a classmate designed a circuit shown in the experiment, the choice of equipment as follows:

A Dry battery to be tested (EMF is E, internal resistance is R)

B Ammeter (0~0.6 A, internal resistance approx. 0.1 Ω)

C Sensitive current meter g (full bias current Ig=200μa, internal resistance Rg=1000ω)

D Slide Rheostat Rx1 (0~20ω, 2.0 A)

E. Slide Rheostat Rx2 (0~1000ω, 12.0 A)

F. Fixed resistor R1 (9000ω)

G Fixed resistor R2 (90Ω)

H. Switch S one, wire several

(1) The sliding rheostat Rx Mayors (optional "Rx1" or "Rx2") in a figure, the fixed value resistor r Mayors (optional "R1" or "R2");

(2) In the experiment, before closing the switch s, the slide of the sliding rheostat should be moved to (fill "a -end", "central" or "B -terminal");

(3) If the indicator of the sensitive galvanometer G is expressed in I1, the indicator of ammeter A is denoted by i2, B is shown in the experiment plotted I1-i2 graph line, from the graph line can be obtained the electromotive force of the measured dry cell E = V (retains 3 digits), internal resistance r= Ω (retains 2 valid digits).

Three The topic includes 4 small questions, a total of 45 points. Write the necessary textual explanations, equations, and important calculation steps for the solution. The only one who writes the final answer cannot score. For numerical calculations, the answer must be clearly written out in numbers and units.

13. (10 points), there is a uniform strong electric field in the vertical plane, the direction of the electric field and the horizontal line AB into θ angle, a mass of m, a charge of Q of the positive ball from the electric field of a point from standstill, just can move to B Point, known as the ball movement time is T,AB distance is D, the gravitational acceleration is g. Trial:

(1) The tangent of the θ angle;

(2) The size of the electric field strength E .

14. (11 points), long enough smooth metal guide MN, PQ parallel fixed on the horizontal plane, the guide pitch L =1.0m, two guide rail left side M, P is connected with a resistor R(unknown value) and an ideal voltmeter. A resistance R=2ω metal rod AB vertical guide rail placed and along the rail with a speed of v0 to the right of the horizontal movement; Now in the two rails with the magnetic induction B=0.5t, the direction of the vertical downward uniform magnetic field, while the rod applied a perpendicular to the bar of the horizontal constant force F, after which the voltmeter shows constant 4v,4 s within R The heat generated on the top is 4J. Do not count other resistors. Request:

(1) The speed of the metal rod ab movement v0;

(2) The size of the constant force F .

  

15. (12 points), the horizontal and inclined parts of the insulating track in the vertical plane are smoothly connected at N points, and the angle between thePN and the horizontal plane is θ. the vertical dashed line with N points is bounded, and the left side has a uniformly strong electric field with horizontal right direction. , the right side has a uniform magnetic field perpendicular to the paper, the magnetic induction size is B. A small object with a mass of mand a charge of Q starts from the m -point and moves along the track just to reach the highest point of the orbit. P, then returns along the original path, and when it reaches the midpoint of the ramp, the small object just leaves the bevel. It is known that the distance between MandN is L, regardless of all friction and g, the acceleration of gravity is:

(1) The electrical nature of small objects and the direction of uniform magnetic field;

(2) The size of the electric field strength E .

16. (12 points), in the xOy coordinate system, with the coordinate Origin o as the center, the radius of $\frac{\sqrt{3}}{2}$L in the circular region exists in the direction perpendicular to the paper outward, A uniform magnetic field with a magnetic flux density of B . A positive particle with a charge of Qand a mass of m (excluding gravity) at a speed of $\frac{qbl}{2m}$ from Origin o along y the axis is entering the magnetic field, and after a while the particles leave the magnetic field from P Point on the boundary of the circular magnetic field.

(1) The coordinates of the P Point are obtained;

(2) The time to seek the movement of particles in the magnetic field;

(3) If the area outside the magnetic field and a uniform electric field parallel to the paper, so that the particles from P point a magnetic field is perpendicular to the speed of the electric field force, to make the particles cannot pass the x -axis, the direction and size of the electric field strength at least how much?

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Huanggang 2017 high two period physics test