Question
Physics Question on Electrical Instruments
In a tangent galvanometer, a current of 1A produces a deflection of 30?. The current required to produce a deflection of 60? is
A
3A
B
2A
C
4A
D
1A
Answer
3A
Explanation
Solution
Current in tangent galvanometer
I=GHtanθ
Where G = galvanometer constant
H= earth's horizontal field = constant
∴I2I1=tanθ2tanθ1⇒I2I=tan60∘tan30∘
⇒I2=tan30∘tan60∘=0.57741.7321=2.999A˙
⇒I2=3A