Physics Electromagnetic Induction PMDC 2020
PMDC Verified Question 65 of 69
If a stationary bar magnet is placed near a coil at rest so maximum lines of force passes through the coil, the galvanometer shows:
A
Maximum current
B
Minimum current
C
No current
D
Intermediate value of current
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: No current
Concept:

Faraday's Law of Electromagnetic Induction dictates that an EMF is only induced when there is a change in magnetic flux over time.

Formula:

$$ \varepsilon = -N \frac{\Delta \phi}{\Delta t} $$

Solution:

  • Since both the magnet and the coil are stationary (\( \Delta \phi / \Delta t = 0 \)), the flux passing through the coil is constant.


  • Therefore, no EMF is induced, and the galvanometer will show no current.


Why other options are incorrect:

Maximum, minimum, or intermediate currents require relative motion. The quantity of flux linking the coil does not matter; only the rate of change of that flux generates current.

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