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The resistance of an ammeter is 13 Omega...

The resistance of an ammeter is `13 Omega` and its scale is graduated for a current upto `100 A`. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto `750 A` by this meter. The value of shunt resistance is

A

`2Omega`

B

`0.2Omega`

C

`2 "k"Omega`

D

`20 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
Let the shunt resistance be S in a given circle

Given : `l=750" A"`,
`l_(g)=100" A",G=13Omega`
From the figure, `l_(g)G=(l-l_(g))S`
or `100xx13=[750-100]S`
or 650 S
`:." "S=(1300)/(650)=2Omega`
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