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Current sensitivity of a moving coil gal...

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage senstivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

A

`250Omega`

B

`25 Omega`

C

`40Omega`

D

`500Omega`

Text Solution

Verified by Experts

Current sensitivity of galvnometer,
`(theta)/(I)=I_(s)=(BNA)/(c)`
Voltage sensitivity of the galvanometer,
`(theta)/(V)=V_(s)=(BNA)/(cR_(G))`
`or V_(s)=((BNA)/(c))xx(1)/(R_(G))=I_(s)xx(1)/(R_(G))`
or`R_(G)=(I_(s))/(V_(s))=(5)/(20xx10^(-3))=250Omega`
The option A is correct.
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