Question

In the given circuit total resistance of wire is 3W, then the value of E is –

• A. 0.75 V
• B. 1 V
• C. 2V
• D. None

Answer 1

Answer: (D)

None

Answer 2

I = $\frac { \mathrm { V } } { \mathrm { R } _ { \mathrm { eq } } }$ = $\frac { 4 } { 2 + 1 + 3 }$ = $\frac { 4 } { 6 }$ = 0.67A

Resistance of 50 cm wire = $\frac { 3 } { 2 }$ = 1.5 W

e = 1.5 × 0.67 = 1V