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the deflection in a moving coil galvenom...

the deflection in a moving coil galvenometre falls from `50` divisions to `10` divisions when a shunt of `12 Omega` is applied. What is the resistance of the galvenometre? Assume the main current to remain same.

A

20 `Omega`

B

40 `Omega`

C

50 `Omega`

D

48 `Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
Let the current for one division galvanometer be i
Current through the galvanometer `I_(2) = 10 i`
Currnet through the ammeter I = 50i
`S = (I_(2)G)/((I - I_(2)))`
`G = S ((I-I_(2))/(I_(2)))`
`G = 12 xx [(50i - 10i)/(10i)]`
`= 12 xx ((40 i)/(10i))= 48 Omega`
G = = 48 `Omega`
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