Explanation
As the magnet moves towards the coil, the magnetic flux increases (non-linearly). Also there is a change in polarity of induced e.m.f. when the magnet passes on to the other side of the coil.
When loop enters in field between the pole pieces, flux linked with the coil first increases (constantly) so a constant e.m.f. induces. When coil enters completely within the field, there is no flux change, so e = 0. When coil exists, flux linked with the coil decreases, hence again e.m.f. induces, but in opposite direction.
According to i – t graph, in the first half current is in increasing uniformly so a constant negative e.m.f. induces in the circuit.
In the second halt current in decreasing uniformly so a constant positive e.m.f. induces Hence, graph (c) is correct.
At the time t = 0, e is max and is equal to E, but current i is zero.
As the time passes, current through the circuit increases but induced e.m.f. decreases.
The magnetostaric field lines and induced electric field lines can form closed loops.
Hence, (b) and (d) are correct options
When a metallic conductor is moved in a magnetic field; magnetic flux is varied. It disturbs the free electrons of the metal and sets up an induced e.m.f. in
As there are no free ends of the metal, 1. e., it will be closed in itself so there will be induced current.
According to Faraday’s laws, the conversion of mechanical energy into electrical energy is in accordance with the law of conservation of energy. It is also clearly known that in pure resistance, the e.m.f. is in phase with the current.
Presence of magnetic flux cannot be produce current.
If the wires are twisted together, they can be formed as a single wire carrying currents in opposite directions. in this pattern, in wires no magnetic field is induced which does not affect adjacent circuits.
Since both the loops are identical (same area and number of turns) and moving with a same speed in same magnetic field. Therefore same e.m.f. is induced in both the coils. But the induced current will be more in the copper loop as its resistance will he lesser as compared to that of the aluminium loop.
The inductance coils made of copper will have very small ohmic resistance. Due to change in magnetic flux a large induced current will be produced in such an inductance coil which will offer appreciable opposition to the flow of current.
Self-inductance of a coil is its property by virtue of which the coil opposes any change in the current flowing through it.
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