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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
A metallic ring with a small cut is held horizontally and a magnet is allowed to fall  vertically through the ring then the acceleration of the metallic ring is :
  • ✓
    always equal to $g$
  • B
    initially less than a but greater than $g$ once it passes through the ring
  • C
    initially greater than $g$ but less than $g$ once it passes through the ring
  • D
    always less than $g$
✓

Answer

Correct option: A.
always equal to $g$
a
Since, the ring is not continuous (dut to the cut) there will be no current flowing in it. Now,  as there is no current hence no force acts on the magnet due to the ring, other than  gravity.

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