EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There needs to be a switch in the circuit.
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There cannot be a switch in the circuit.
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The wire must be part of a closed circuit.
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The wire must be part of an open circuit.
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Detailed explanation-1: -The true order for magnetism to induce an electric current in a wire is, the wire must be part of a closed circuit. The correct option is (C).
Detailed explanation-2: -What must be true in order for magnetism to induce an electric current in a wire? The wire must be part of a closed circuit.
Detailed explanation-3: -There must be relative motion between the magnetic lines of force and the conductor in order for a voltage to be induced. If a conductor is resting in the flux field, or if the conductor and the flux field are both moving together in the same direction with the same velocity, no voltage is induced.
Detailed explanation-4: -If we move a conductor in a magnetic field, a current is induced in the conductor (wire). An AC current in a coil of wire can induce an AC current in another nearby coil of wire.
Detailed explanation-5: -Moving magnetic fields pull and push electrons. Metals such as copper and aluminum have electrons that are loosely held. Moving a magnet around a coil of wire, or moving a coil of wire around a magnet, pushes the electrons in the wire and creates an electrical current.