OnlineCBT
Physics · PYQ NEET UG 2024
हिन्दीA sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to : A. hold the sheet there if it is magnetic. B. hold the sheet there if it is non-magnetic. C. move the sheet away from the pole with uniform velocity if it is conducting. D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar. Choose the correct statement(s) from the options given below:
Correct answer · Option 4
A and C only
Explanation
If the sheet is magnetic, force is required to counteract magnetic attraction. If conducting, moving it changes flux, producing eddy currents and an opposing magnetic force (Lenz's law), requiring an external force to maintain uniform velocity.
