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# High School Physics Peiyou Electromagnetic Induction Rails

Senior Physics Training-Exercise of Conductor Rod in Magnetic Field

(A) single stick

1. As shown in the figure, a sufficiently long "n" -shaped conductor frame has a width of L, and its plane is perpendicular to the horizontal plane, and the resistance can be ignored. B. Let the uniform magnetic field be perpendicular to the plane of the conductor frame, and the magnetic induction intensity be B. A conductor rod ab is placed on the frame, and the conductor rod is released by the static sliding down along the frame, and it is always kept horizontal. The friction between the conductor rod and the frame is f. R, then the direction of the induced current in ab is: () A. ab B. ba

C. does not exist D. cannot be determined

2. The change in the acceleration during ab sliding in the previous question is: () A. From small to large B. B. From big to small B. when small constant

3． The maximum speed of ab in the previous question is equal to: ()

mgRfR (mg f) R (mg f) R

ABCD

B2L2B2L2B2L2B2L2

2. As shown in Figure A, a pair of parallel rough guide rails of sufficient length are fixed on the horizontal plane, the distance between the two guide rails is l = 1m, and the left end is connected by a resistor of R = 3Ω, and the resistance of the guide rail is ignored. A conductor rod with a mass of m = 0.5kg and a resistance of r = 1Ω is statically placed on two guide rails, and one or two guide rails are vertical. The entire device is in a uniform magnetic field with a magnetic induction intensity of B = 2T, and the direction of the magnetic field is perpendicular to the plane of the guide rail. At present, the conductor rod is pulled horizontally to the right by a pulling force F. The relationship between the pulling force F and time t is shown in Figure B. The conductor rod just happens to perform a uniformly accelerated linear motion. in

b

The work done by the pull force F within 0 ~ 2s is W , Gravity acceleration g = 10m / s2. begging:

(1) The dynamic friction factor μ between the conductor rod and the guide rail; (2) The electric quantity q passing the resistance R within 0 ~ 2s;

(3) The amount of thermal energy Q generated by the resistance R within 0 ~ 2s.  ### Word Documents Free Download: High School Physics Training 