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IIT JEE Advanced 2008 Paper 2
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Question : 12
Total: 66
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.
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
Statement-1 is True, Statement-2 is False.
Statement-1 is False, Statement-2 is True.
Validate
Solution:
The current sensitivity is
S
i
=
ϕ
6
=
N
B
A
C
where
S
i
can be increased by using a suitable magnetic material as a core inside the coil as that would increase B. High permeable magnetic material can, easily, be magnetized and demagnetized.
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