Question

An inductance coil have the time constant 4 sec.if it is cut into two equal parts and connected parallel then new time constant of the circuit is?(1)4sec(2)2sec(3)1sec)4)0.5sec.

Answer 1

Inductance of the circuit = 4 seconds

Explanation:

Given: An inductance coil has the time constant 4 sec.

Find: If it is cut into two equal parts and connected in parallel, then the new time constant of the circuit will be?

Solution:

Combination of inductance is same as resistance. When the wires are cut into two, but connected in series, then the sum of inductance will be the sum of the individual wires. Each wire will have 2 seconds inductance but the circuit will still have the same 4 second inductance as before.

Option 1 is the answer.