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Faradays Laws Of Induction Free Doubts and Solutions

CBSE - XII Science - Physics - Electromagnetic Induction

Curies law illustration

Asked by rraj.15266 1st November 2017, 8:24 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

State Lenz's Law. A metallic rod held horizontally along east-west direction, is allowed to fall under gravity. Will there be an emf induced at its ends? Justify your answer.

Asked by Topperlearning User 7th July 2015, 2:32 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

When the magnetic flux passing through a coil changes, will the induced emf and current be always produced in the coil ?

Asked by Topperlearning User 7th July 2015, 2:10 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

Show that Lenz’s law can be treated as a consequence of principle conservation of energy.

Asked by Topperlearning User 7th July 2015, 9:50 AM
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CBSE - XII Science - Physics - Electromagnetic Induction


What is the significance of negative sign in the expression of emf

begin mathsize 12px style straight epsilon equals negative dϕ over dt end style

where the symbols have their usual meaning.

Asked by Topperlearning User 6th July 2015, 4:46 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

A uniform magnetic field B exists from the square frame of copper wire of area (A)10-2 m² in a direction perpendicular to its plane. The magnetic field changes with time at a steady rate of 0.08 T/s. find the current induced in the frame, if resistance(R) of the loop is given 2×10-3 Ω

Asked by Topperlearning User 6th July 2015, 4:46 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

In the closed circuit of resistance(r) 10 Ω, the magnetic flux Φ  varies with time t according to the equation Φ = (6t² - 9t +3) milli weber. Calculate the magnitude of induced current at t = 0.5 second.

Asked by Topperlearning User 6th July 2015, 4:02 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

The magnetic flux linked with the circuit changes from 8×10-3 Wb to 4×10-3 Wb in 0.01 second. Calculate the emf induced in the circuit.

Asked by Topperlearning User 6th July 2015, 3:43 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

Does the change in the magnetic flux linked with the coil/circuit always induce current?

Asked by Topperlearning User 6th July 2015, 2:52 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

Find the emf induced in the coil of 200 turns and cross-section area 0.4 m², when a magnetic field perpendicular to the plane of the coil changes from 0.1 Wbm-2 to 0.5 Wbm-2, at a uniform rate over a period of 0.04 sec.

Asked by Topperlearning User 6th July 2015, 2:51 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

A coil of cross-sectional area 10² cm² is placed in the magnetic field, which changes to 8×10-2 wb/cm² with in 5 seconds. What will be the current across 5 Ω resistances?

Asked by Topperlearning User 6th July 2015, 2:45 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

Enlist the factors on which the induced emf depends?

Asked by Topperlearning User 6th July 2015, 2:38 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

State Lenz's law.

Asked by Topperlearning User 6th July 2015, 2:23 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

A coil made of copper wire of length l is kept stationary in the uniform magnetic field. How much is the emf induced in the coil?

Asked by Topperlearning User 6th July 2015, 2:06 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

How does the motion of magnet in Faraday's experiment affect the induced emf?

Asked by Topperlearning User 6th July 2015, 2:04 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

What is the basic cause of induced emf?

Asked by Topperlearning User 6th July 2015, 2:04 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

State Faraday's laws of electromagnetic induction.

Asked by Topperlearning User 6th July 2015, 2:02 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

Why did Faraday use a hollow paper cylinder as the core of the coil connected to a galvanometer while changing the magnetic flux linked with the coil by moving a bar magnet in its vicinity and not a ferromagnetic material like iron?

Asked by Chandropal Parashor 2nd August 2014, 7:18 PM
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CBSE - XII Science - Physics - Electromagnetic Induction

A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in fig. will there be any induced emf at the terminals of the coil, when magnet is rotated (a) about its own axis and (b) about an axis perpendicular to the length of the magnet ?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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