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An ammeter of resistance R gives a full ...

An ammeter of resistance R gives a full scale deflection when a current of 30 A is passed through it. We eant to convert it into an ammeter to measure the current only upto 10A. The value of the shunt required for this is

A

`R`

B

`R/2`

C

`R/3`

D

`R/3`

Text Solution

Verified by Experts

The correct Answer is:
B
`I_g/I=I/3=S/(S+R) therefore 3S -S+R therefore S=R/2Omega`.
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