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A range of galvanometer is V, when 50Ome...

A range of galvanometer is V, when `50Omega` resistance is connected in series. Its range gets doubled when `500Omega` resistance is connected in series. Galvanometer resistance is

A

`100Omega`

B

`200Omega`

C

`300Omega`

D

`400Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
`G=(V_1)/(I_g)-R_1=(V_2)/(I_g)-R_2`
`therefore (V)/(I_g)-50=(2V)/(I_g)-500`
`therefore V=450I_g`
Now, `G=(450I_g)/(I_g)-50=400Omega`.
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