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# Motional Emf Free Doubts and Solutions

## What happens when a toroid uses bismuth in its core?

Asked by prernakhokhar1 28th September 2018, 12:23 AM

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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 27th July 2018, 9:24 AM

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## A metallic rod of length l is rotated at a constant angular speed ω, normal to a uniform magnetic field B. Derive an expression for the current induced in the rod, if the resistance of the rod is R.

Asked by Topperlearning User 7th July 2015, 2:33 PM

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## A metallic rod of length 'l' is rotated with a frequency with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant uniform magnetic field B parallel to the axis is present every where. Using Lorentz force, explain how emf is induced between the centre and the metallic ring and hence obtain the expression for it.

Asked by Topperlearning User 7th July 2015, 2:32 PM

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## Magnetic flux in a coil changes from 13 × 10-3 Wb to 5 × 10-3 Wb in 0.02 sec. Find the induced emf.

Asked by Topperlearning User 7th July 2015, 10:16 AM

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## a) What will be the direction of the induced current in the following setup? In figure b) a steady current flows through the wire find the direction of induced emf?

Asked by Topperlearning User 7th July 2015, 10:12 AM

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## The expression for magnetic flux is given by Calculate the emf induced at t = 3 s.

Asked by Topperlearning User 7th July 2015, 10:11 AM

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## Induced emf results into induced current, which laws help in finding the direction of this current?

Asked by Topperlearning User 7th July 2015, 10:10 AM

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## 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 7th July 2015, 10:09 AM

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## What are the conditions under which no emf will be induced in the circuit?

Asked by Topperlearning User 7th July 2015, 10:07 AM

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## 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 7th July 2015, 9:58 AM

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## What is induced emf ?

Asked by Topperlearning User 7th July 2015, 9:56 AM

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## A metallic rod of 'L' length is rotated with angular frequency of 'ω' with one end hinged at the centre and the other end at the circumference of a circular metallic ring or radius L, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere. Deduce the expression for the emf between the centre and the metallic ring.

Asked by Topperlearning User 6th July 2015, 1:53 PM

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## What are Foucault currents?

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