Question:
In Faraday-Henry's experiment, a coil is connected to a galvanometer. For the deflection of pointer in the galvanometer, which of the following statement/s is/are WRONG?
The pointer in the galvanometer deflects -
(a) When the bar magnet is moved towards the stationary coil along its axis
(b) When the bar magnet is moved away from the stationary coil along its axis
(c) When the coil is moved towards the stationary bar magnet along its axis
(d) When the coil and the magnet are moved without relative motion between them
In Faraday-Henry's experiment, a coil is connected to a galvanometer. For the deflection of pointer in the galvanometer, which of the following statement/s is/are WRONG?
The pointer in the galvanometer deflects -
(a) When the bar magnet is moved towards the stationary coil along its axis
(b) When the bar magnet is moved away from the stationary coil along its axis
(c) When the coil is moved towards the stationary bar magnet along its axis
(d) When the coil and the magnet are moved without relative motion between them
The pointer in the galvanometer deflects -
(a) When the bar magnet is moved towards the stationary coil along its axis
(b) When the bar magnet is moved away from the stationary coil along its axis
(c) When the coil is moved towards the stationary bar magnet along its axis
(d) When the coil and the magnet are moved without relative motion between them
Show Hint
Galvanometer deflection is a direct indicator of induced current. Induced current requires a \textbf{rate of change} of magnetic flux (\( \frac{d\phi}{dt} \neq 0 \)). If there is no relative motion, the flux is constant and no induction occurs.
Updated On: Apr 23, 2026
- a and b
- b and c
- a, b and c
- Only d
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the incorrect statement regarding the conditions under which a galvanometer connected to a coil shows a deflection during electromagnetic induction experiments.
Step 3: Detailed Explanation:
According to Faraday's experiments, an electromotive force (emf) is induced in a coil only when there is a change in the magnetic flux linked with it. This change in flux is typically caused by the relative motion between the source of the magnetic field (the magnet) and the conductor (the coil).
- Statements (a), (b), and (c): All these cases involve relative motion between the magnet and the coil. This motion changes the magnetic flux passing through the coil, inducing a current and causing the galvanometer pointer to deflect. Thus, these statements describe correct observations.
- Statement (d): When both the coil and the magnet move with the same velocity in the same direction, there is no relative motion between them. Consequently, the magnetic flux through the coil remains constant, no emf is induced, and the galvanometer pointer does not deflect. Stating that the pointer deflects in this scenario is WRONG.
Step 4: Final Answer:
The only wrong statement is (d). Hence, the correct option is (4).
The question asks to identify the incorrect statement regarding the conditions under which a galvanometer connected to a coil shows a deflection during electromagnetic induction experiments.
Step 3: Detailed Explanation:
According to Faraday's experiments, an electromotive force (emf) is induced in a coil only when there is a change in the magnetic flux linked with it. This change in flux is typically caused by the relative motion between the source of the magnetic field (the magnet) and the conductor (the coil).
- Statements (a), (b), and (c): All these cases involve relative motion between the magnet and the coil. This motion changes the magnetic flux passing through the coil, inducing a current and causing the galvanometer pointer to deflect. Thus, these statements describe correct observations.
- Statement (d): When both the coil and the magnet move with the same velocity in the same direction, there is no relative motion between them. Consequently, the magnetic flux through the coil remains constant, no emf is induced, and the galvanometer pointer does not deflect. Stating that the pointer deflects in this scenario is WRONG.
Step 4: Final Answer:
The only wrong statement is (d). Hence, the correct option is (4).
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