Recent questions tagged chapter6

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When the magnetic flux linked with a conducting wire loop changes with time, an ................is induced in the

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In electromagnetic induction, the induced charge in a coil is independent

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If the resistance of a conductor is infinite. The power required to move a conductor in a uniform magnetic field is

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The core of a transformer is laminated to

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The self-inductance of a coil is L. Keeping the length and area same, the number of turns in the coil is increased to four times. The self-inductance of the coil will be

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Which of the following statement(s) is/are

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Which of the following statement(s) is/are

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A square loop is symmetrically placed between two infinitely long current carrying wires in the same direction. Magnitude of currents in both the wires are same. Now, match the Column I with Column II and select the correct answer from the codes given below Column I Column II A. Loop is moved p. Induced current towards right in the loop is clockwise. B. Loop is moved q. Induced current towards left in the loop is anti-clockwise. C. Wire-1 is r. Power in the moved towards loop is zero. left

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Match the Column I (planar loops of different shapes) with Column II (direction of induced current) and select the correct answer from the codes given

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Assertion: Magnetic flux of a magnetic field B passing through an area A is given by the relation `phi= B • A`. Reason: Quantity obtained by product of two vectors is always

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Assertion: Magnetic flux and the electric flux have the same units. Reason: Flux passing through a surface does not gives an idea about the field lines crossing that

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Assertion: When two magnets are brought closer to each other, then they will always repel each other. Reason: According to Lenz’s law induced effects do not always opposes the

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Assertion: If a straight wire is moved in a magnetic field, no emf will be induced across its two ends as the circuit is not closed. Reason: Since, the circuit is not closed, induced current will be

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Assertion: Faraday’s laws are consequence of conservation of energy. Reason: Earth’s magnetic field can induce

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Assertion: Inductance coil are made of copper. Reason: Induced current is more in wire having less

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Assertion: Eddy currents are undersirable. Reason: Eddy currents heat up the core and dissipate electrical energy in the form of

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Assertion: When a metallic conductor is moved in and out in a magnetic field, then an induced emf is produced across it. Reason: Eddy current will not be produced in a metallic surface moving in and out of magnetic

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Assertion: When coil in galvanometer with metallic core oscillates, then electromagnetic damping occurs. Reason: Eddy currents generated in the core opposes the motion and brings the coil to rest

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Assertion: Coefficient of self-induction of an inductor depends upon the rate of change of current passing through it.Reason: From `e=L(di)/(dt)`We can see that, `L=e/((di)/(dt))` or `L prop

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Assertion: The self-induced emf is also called the back emf. Reason: The self-induced emf opposes any change in the current in a

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