Question

In the given circuit, AB is thick copper wire and S is a switch. When the switch is closed, the effective resistance of the circuit will be:

• A. $5\Omega$
• B. $6/5\Omega$
• C. $3\Omega$
• D. Zero

Answer 1

The correct option is C $3\Omega$

When Switch S will close than circuit will be short-circuit therefore current will not flow in upper part of the circuit.

Hence, Equivalent resistance will be $3\Omega$

Option (C) is correct option