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When a resistance of 2 Ohm is connected ...

When a resistance of 2 Ohm is connected across the terminals of a cell, the current is 0.5 A. If a resistance of 5 Ohm is connected across the cell then the current is 0.25 At the emf of the cell is:

A

2 V

B

IV

C

1.5 V

D

0.5 V

Text Solution

Verified by Experts

The correct Answer is:
B
`E = I = (R+r)`
` = IR + Ir`
` :." r" = E/1 - R`
` :." "E/0.5 -2 = E/0.25 - 5`
` :."E " = 1.5 V`
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