KCET · Physics · Electromagnetic Induction
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.
- A a and b
- B b and c
- C a, b and c
- D Only d
Answer & Solution
Correct Answer
(D) Only d
Step-by-step Solution
Detailed explanation
According to Faraday's law of electromagnetic induction, an induced emf is generated in a coil only when there is a change in the magnetic flux linked with it.
This change in magnetic flux occurs when there is a relative motion between the coil and the magnet.
In statements (a), (b), and (c), there is a relative motion between the coil and the magnet, which changes the magnetic flux and induces a current, causing the galvanometer to deflect.
In statement (d), the coil and the magnet are moved without any relative motion between them. The magnetic flux linked with the coil remains constant, so no current is induced and the galvanometer does not deflect.
Therefore, statement (d) is the only wrong statement regarding the deflection of the pointer.
Answer: Only d
This change in magnetic flux occurs when there is a relative motion between the coil and the magnet.
In statements (a), (b), and (c), there is a relative motion between the coil and the magnet, which changes the magnetic flux and induces a current, causing the galvanometer to deflect.
In statement (d), the coil and the magnet are moved without any relative motion between them. The magnetic flux linked with the coil remains constant, so no current is induced and the galvanometer does not deflect.
Therefore, statement (d) is the only wrong statement regarding the deflection of the pointer.
Answer: Only d
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