Question:
Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?
Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?
Updated On: Jul 7, 2022
- Current will increase in each loop
- Current will decrease in each loop
- Current will remain same in each loop
- Current will increase in one and decrease in the other
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The Correct Option is B
Solution and Explanation
When the two loops are brought together, the flux linking the two loops increases. By Lenz's law a current will be induced such that it opposes this change of flux . Therefore to oppose the increase in flux, the current in the two loops will decrease, so the flux decreases.
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Concepts Used:
Lenz’s law
Lenz’s law states that the induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that original flux is maintained through the loop when current flows in it.
It depends on the principle of conservation of energy and Newton’s third law. To determine the direction of the induced current is most convenient method . Induced current states that he direction of an induced current is always such as to oppose the change in the circuit or the magnetic field that produces it.
Lenz’s Law Formula
The Lenz’s Law is reflected in the formula of Faraday’s law. Here the negative sign is contributed from Lenz’s law. The expression is –
Where,
