Final answer:
Correct option : 2) more. The magnitude of the induced e.m.f in an LR circuit is greater at the break of the circuit compared to its value at the make of the circuit.
Step-by-step explanation:
The magnitude of the induced e.m.f in an LR circuit at the break of the circuit, compared to its value at the make of the circuit, depends on Faraday's and Lenz's Laws.
According to Faraday's law of induction, the induced e.m.f is directly proportional to the change in flux and inversely proportional to the change in time.
Lenz's law states that the induced e.m.f opposes the change in magnetic flux.
When the circuit is made, the magnetic flux through the inductor increases, resulting in a positive induced e.m.f.
At the break of the circuit, the magnetic flux decreases, causing a negative induced e.m.f.
Therefore, the magnitude of the induced e.m.f at the break of the circuit is greater than its value at the make of the circuit.