A resistor and a resistor are connected in series to a battery

PHYSICS · Single correct · CBSE · Physics · Electricity · Electricity

Problem

4\,\Omega

resistor and a

6\,\Omega

resistor are connected in series to a

12\,\text{V}

battery. A switch

S

is connected across the

6\,\Omega

resistor. When

S

is open, the circuit current is

I_1

. Closing

S

connects a

12\,\Omega

resistor in parallel with the

6\,\Omega

resistor, and the new circuit current becomes

I_2

. What is the ratio

I_2/I_1

? (a) 1.43 (b) 0.77 (c) 1.25 (d) 2.5