First slide

Applications involving charged particles moving in a magnetic field

Question

A moving coil galvanometer A has 200 turns and a resistance of 100Ω. Another meter B has 100 turns resistance 40Ω. All the other quantities are same in both the cases. The current sensitivity of A is x times of B, the value of x is

Moderate

Solution

$C u r r e n t s e n s i t i v i t y (S) = \frac{B A N}{C} \Rightarrow S α N \Rightarrow \frac{S_{A}}{S_{B}} = \frac{N_{A}}{N_{B}} = \frac{200}{100} = \frac{2}{1} \Rightarrow S_{A} = 2 S_{B}$

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