Question

What is the e.m.f of the cell C in the circuit shown in figure, if the deflection in the galvanometer is zero, the resistance of the wire is 3 `Omega`, The length of the wire is 100 cm?

Options

• 0.25 V

• 0.50 V

• 0.75 V

• 1.00 V

Answer 1

0.50 V

Explanation:

`"Current in circuit" = (4"V")/(12 Omega) = (1/3) "A"`

Potential drop across 50 cm of wire

`= (1/3) "A" xx 1.5 Omega`

`= 0.5  "V"`

Same is the e.m.f of the cell.