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Moving Charges And Magnetism

Question
CBSEENPH12047788
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The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

  • horizontal

  • vertical

  • clockwise

  • Anticlockwise

Solution

C.

clockwise

The induced emf will oppose the motion of the magnet. Applying the right-hand rule, the direction of induced current will be clockwise.

                           

Above image shows the direction of the magnetic force acting on a charged particle. The force on a positively charged particle with velocity v and making an angle θ with the magnetic field B is given by the right-hand rule. 

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.

Answer the following questions:
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?

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