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Test: Magnitude of EMF Induced in a Coil


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Test: Magnitude of EMF Induced in a Coil - Question 1

The formula for induced emf is ______

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 1

The formula for induced emf is: emf=Blv, where B is the magnetic field, l is the length of the conductor and v is the velocity with which it is moving in the magnetic field.

Test: Magnitude of EMF Induced in a Coil - Question 2

Which, among the following, is the formula for induced emf?

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 2

The formula foe induced emf is e=d(phi)/dt because the induced emf is the flux linkage per unit time.

Test: Magnitude of EMF Induced in a Coil - Question 3

Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 3

The formula for induced emf is: emf=Blv. Substituting the values of B, emf and v from the question, we get l=6.25m.

Test: Magnitude of EMF Induced in a Coil - Question 4

If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced.

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 4

The formula for induced emf is: emf=Blv. Substituting the values of B, l and v from the question, we get emf=0.3V.

Test: Magnitude of EMF Induced in a Coil - Question 5

 What is emf?

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 5

Electromotive force is not actually a force. It is basically a voltage. It is the voltage developed by any source of electrical energy.

Test: Magnitude of EMF Induced in a Coil - Question 6

Find the strength of magnetic field in a conductor 0.5m long moving with a velocity of 10m/s, inducing an emf of 20V.

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 6

The formula for induced emf is: emf=Blv. Substituting the values of l, emf and v from the question, we get B=4T.

Test: Magnitude of EMF Induced in a Coil - Question 7

The emf induced in a coil having N turns is?

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 7

The emf induced in a coil having N turns is, e=N*phi/t. This is because, the emf in a single coil is the flux linkage per unit time, that is, phi/t. Hence the flux induced in N turns is N*phi/t.

Test: Magnitude of EMF Induced in a Coil - Question 8

 An E.M.F. can be induced by _______

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 8

The dot product of magnetic field vector and area vector.
emf=BAcos(theta), hence if either of the three, that is, magnetic field, area or angle changes, thee emf will change.

Test: Magnitude of EMF Induced in a Coil - Question 9

What is the consequence of motor effect?

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 9

Motor effect is when a current carrying conductor in a magnetic field experiences a force, hence its consequence is electromagnetic induction.

Test: Magnitude of EMF Induced in a Coil - Question 10

The total number of magnetic field lines passing through an area is termed as _______

Detailed Solution for Test: Magnitude of EMF Induced in a Coil - Question 10

The number of magnetic flux lines per unit area is the magnetic flux, because flux is the number of field lines per unit area.

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