In the circuit shown, the current through 8 ohm is same before and after connecting E. The value of E is

Options

A. 12 V
B. 6 V
C. 4 V
D. 2 V

Answer

C

Explanation

Before
`I = 12/24 = 1/2 A`
After
`I = E/8 rArr E = 8 xx 1/2 = 4V`