Recent questions tagged #mcq

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: In the phenomenon of mutual induction, self-induction of each of the coils persists. Reason: Self-induction aries when strength of current in same coil changes. In mutual induction, current is changing in both the individual

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: If the inner solenoid is much shorter than (and placed well inside) the outer solenoid, then the flux linkage `N_1phi_1` can still be calculated. Reason: The inner solenoid is effectively immersed in a uniform magnetic field due to the outer

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: Mutual inductance of two coils does not depends on the distance between the coils and their orientation. Reason: It does not depend on the magnetic material filled between the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxOn the basis of Faraday’s law, current in the coil is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxThe flux linked with a circuit is given by `phi=t^3+3t-7`. The graph between time (X-axis) and induced emf (Y-axis) will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxWire loop is rotated in a magnetic field. The frequency of change of direction of the induced emf

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxThe instantaneous magnetic flux linked with a coil is given by `phi= (5t^3 -100t + 300) Wb`. The emf induced in the coil at time `t = 2 s`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Faraday’s Laws According to the Faraday’s first law, whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in it. Induced current is determined by the rate at which the magnetic flux changes.Mathematically, the magnitude of the induced emf in a circuit is equal to the rate of change of magnetic flux through the circuit.Induced emf `prop` Rate of change of magnetic fluxA copper disc of radius 0.1 m is rotated about its centre with 20 rev/s in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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