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The current in a circuit containing a ba...

The current in a circuit containing a battery connected to `2Omega` resistance is 0.9A. When a resistance of `7Omega` connected to the same battery, the current observed in the circuit is 0.3 A. Then the internal resistance of te battery is

A

`0.1Omega`

B

`0.5Omega`

C

`1Omega`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
`(E)/(2+r)=0.9` .(i)
`(E)/(7+r)=0.3` ..(ii)
`(i)/(ii)(7+r)/(2+r)=3`
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