Question
Write Faraday's laws of electromagnetic induction.
✓
Answer
Faraday's Laws of electromagnetic induction :
(1) Whenever there is a change in the magnetic flux linked with a coil, emf is induced in the coil. This emf is called induced emf and it lasts so long as the change in the flux is taking place. When the coil circuit is closed an electric current flows through the circuit corresponding to induced emf and is known as induced current. This phenomenon is called electromagnetic induction.
(2) The induced emf is equal to the negative rate of change of magnetic flux.
If $\Delta\Phi$ be the change in magnetic flux linked with a circuit in time interval $\Delta t$ then the induced emf in the circuit according to second law is given by:
$e=-(\frac{\Delta\Phi}{\Delta t})$ ...(1)
Under the condition: lim $\Delta t \rightarrow 0$ equation (1) in its differential form can be expressed as follows:
$e=-(\frac{d\Phi}{dt})$ ...(2)
The (-ve) sign indicates that the induced emf opposes the change in magnetic flux.
(1) Whenever there is a change in the magnetic flux linked with a coil, emf is induced in the coil. This emf is called induced emf and it lasts so long as the change in the flux is taking place. When the coil circuit is closed an electric current flows through the circuit corresponding to induced emf and is known as induced current. This phenomenon is called electromagnetic induction.
(2) The induced emf is equal to the negative rate of change of magnetic flux.
If $\Delta\Phi$ be the change in magnetic flux linked with a circuit in time interval $\Delta t$ then the induced emf in the circuit according to second law is given by:
$e=-(\frac{\Delta\Phi}{\Delta t})$ ...(1)
Under the condition: lim $\Delta t \rightarrow 0$ equation (1) in its differential form can be expressed as follows:
$e=-(\frac{d\Phi}{dt})$ ...(2)
The (-ve) sign indicates that the induced emf opposes the change in magnetic flux.
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