Directions: These questions consist of two statements, each printed a...
According to Lenz's Law, the current is induced in such a direction that it opposes the change in magnetic flux linked with the coil. Lenz's law is in accordance with the Principle of Conservation of Energy. Hence, both Assertion and Reason are correct and Reason is a correct explanation of Assertion.
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Directions: These questions consist of two statements, each printed a...
Assertion: An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current.
Reason: Above statement is in accordance with conservation of energy.
Correct answer: Option A - If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Explanation:
Assertion: An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current.
When there is a change in magnetic flux through a conductor, an electromotive force (EMF) is induced in the conductor according to Faraday's law of electromagnetic induction. This induced EMF causes an induced current to flow in the conductor. According to Lenz's law, the direction of the induced current is such that it creates a magnetic field that opposes the change in magnetic flux that induced it.
Reason: Above statement is in accordance with conservation of energy.
The reason for the given assertion is that the direction of the induced current, which opposes the change in magnetic flux, is in accordance with the conservation of energy. When there is a change in magnetic flux, there is an associated change in magnetic field. According to the law of conservation of energy, work must be done to induce this change in magnetic field. The induced current, which opposes the change in magnetic flux, does work against the induced EMF and, therefore, conserves energy.
Explanation:
When a change in magnetic flux occurs, such as when a magnet moves towards or away from a coil of wire, the magnetic field passing through the coil changes. This change in magnetic field induces an EMF in the coil. The induced EMF causes charges to move, creating an induced current in the coil.
According to Lenz's law, the direction of the induced current is such that it creates a magnetic field that opposes the change in magnetic flux that induced it. This can be understood using the principle of conservation of energy. When there is a change in magnetic flux, work needs to be done to induce this change in magnetic field. The induced current, which opposes this change, does work against the induced EMF and, therefore, conserves energy.
By opposing the change in magnetic flux, the induced current creates a magnetic field that counteracts the change in the external magnetic field. This opposition limits the rate of change of the magnetic flux and, as a result, reduces the induced EMF. This phenomenon is utilized in many applications, such as transformers and inductors, where the direction of the induced current is controlled to achieve specific outcomes.
Therefore, both the assertion and the reason are correct, and the reason is a correct explanation of the assertion.