Magnetics Ques 2
Assertion and Reason
Mark your answer as
(a) If Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I
(b) If Statement I is true, Statement II is true; Statement II is not a correct explanation for Statement $I$
(c) If Statement I is true; Statement II is false
(d) If Statement I is false; Statement II is true
- Statement I The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core outside the coil.
Soft iron has a high magnetic permeability and can be easily magnetised and demagnetised.
(2008, 3M)
Show Answer
Answer:
Correct Answer: 2.( c )
Solution:
- $c \theta=B I N A \Rightarrow \theta=\left(\frac{B N A}{c}\right) I$
Using iron core, value of magnetic field increases. So, deflection increases for same current. Hence, sensitivity increases.
Soft iron can be easily magnetised or demagnetised.
BETA
