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CBSE Class 12-science Answered

What is induced emf ?
Asked by Topperlearning User | 07 Jul, 2015, 09:56: AM
answered-by-expert Expert Answer
Faraday observed that, whenever the amount of magnetic flux linked with a conductor changes, an emf is induced and it lasts as long as the magnetic flux through the conductor changes. The magnitude of the induced emf is directly proportional to rate of change of the magnetic flux.
If begin mathsize 11px style straight ϕ subscript 2 minus straight ϕ subscript 1 end style represents the change in flux in time t, therefore,
 
Answered by | 07 Jul, 2015, 11:56: AM

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CBSE 12-science - Physics
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A jet plane is travelling due west at the speed of 1800 km/h. what is the voltage difference developed between the ends of the wings 25m long, if the earths magnetic field at the location is 0.0005 T and the dip angle is 30°？  
Asked by sbtech357 | 27 Jul, 2018, 09:24: AM
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CBSE 12-science - Physics
What is induced emf ?
Asked by Topperlearning User | 07 Jul, 2015, 09:56: AM
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CBSE 12-science - Physics
The figure shows the variation of field strength versus time of a loop kept in a magnetic field From the graph answer the following questions: a) Would there be any induced voltage if yes state when? b) During BC, CD and DE will there be flow of current?
Asked by Topperlearning User | 07 Jul, 2015, 09:58: AM
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CBSE 12-science - Physics
What are the conditions under which no emf will be induced in the circuit?
Asked by Topperlearning User | 07 Jul, 2015, 10:07: AM
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CBSE 12-science - Physics
Calculate the emf induced in a wire of 2 m moving with a speed of 15 m/s perpendicular to a magnetic field of 2 Wb /m2.
Asked by Topperlearning User | 07 Jul, 2015, 10:09: AM
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CBSE 12-science - Physics
Induced emf results into induced current, which laws help in finding the direction of this current?
Asked by Topperlearning User | 07 Jul, 2015, 10:10: AM
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CBSE 12-science - Physics
The expression for magnetic flux is given by Calculate the emf induced at t = 3 s.
Asked by Topperlearning User | 07 Jul, 2015, 10:11: AM
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