A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

Magnetism and Electromagnetism
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

First increases and then decreases depending on the depth of iron in¬sertion

Decreases

Increases

Remains same

First increases and then decreases depending on the depth of iron in¬sertion

Decreases

Increases

Remains same

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

3 AT

30 AT

0.3 AT

300 AT

3 AT

30 AT

0.3 AT

300 AT

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Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

31.25 V

2,000 V

1,000 V

3,125 V

31.25 V

2,000 V

1,000 V

3,125 V

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Permanent magnets

Non-magnetic substances

Electromagnets

Transformers

Permanent magnets

Non-magnetic substances

Electromagnets

Transformers

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

None of these

Both of the listed here

strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

None of these

Both of the listed here

strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

100 At

200 At

150 At

300 At

100 At

200 At

150 At

300 At

ANSWER DOWNLOAD EXAMIANS APP

Magnetism and Electromagnetism

Magnetism and Electromagnetism A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

Magnetism and Electromagnetism What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

Magnetism and Electromagnetism The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

Magnetism and Electromagnetism The retentivity of material is useful for the construction of

Magnetism and Electromagnetism Main causes of noisy solenoid are

Magnetism and Electromagnetism What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

Magnetism and Electromagnetism
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Magnetism and Electromagnetism
Main causes of noisy solenoid are

Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?