STATEMENT-1
The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
and
STATEMENT-2
Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.
The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
and
STATEMENT-2
Soft iron has a high magnetic permeability and cannot be easily magnetized or demagnetized.
- (A)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
- (B)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
- (C)STATEMENT-1 is True, STATEMENT-2 is False✓ Correct
- (D)STATEMENT-1 is False, STATEMENT-2 is True
Answer: (C)
Solution
STATEMENT-1 is true: Placing a soft iron core inside the coil increases the magnetic field strength, which increases the torque for a given current, thus increasing sensitivity.
STATEMENT-2 is false: Soft iron has high magnetic permeability and CAN be easily magnetized and demagnetized (that's why it's called "soft" iron). This property makes it suitable for use in galvanometers.
STATEMENT-2 is false: Soft iron has high magnetic permeability and CAN be easily magnetized and demagnetized (that's why it's called "soft" iron). This property makes it suitable for use in galvanometers.
JEE Advanced · 2008 · 13 Apr 2008 · Paper 2 · Single correct option