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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

`0.1 ohm`

B

`0.5 ohm`

C

`1 ohm`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
B
`E/ (2 + r) = 0.9` ----- (1)
`E/(7 + r) = 0.3` ----- (2)
`(1)/(2) = (7 + r)/(2 + r) = 3`
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