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?

Increases

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

Remains same

Decreases

Increases

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

Remains same

Decreases

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Magnetism and Electromagnetism
Core of an electromagnet should have

None of the listed here

High susceptibility

Both low coercivity and high susceptibility

Low coercivity

None of the listed here

High susceptibility

Both low coercivity and high susceptibility

Low coercivity

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

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

None of these

Both of the listed here

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

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

None of these

Both of the listed here

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

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Magnetism and Electromagnetism
The magnetomotive force is

The voltage across the two ends of exciting coil

The flow of an electric current

The passage of magnetic field through an exciting coil

The sum of all currents embraced by one line of magnetic field

The voltage across the two ends of exciting coil

The flow of an electric current

The passage of magnetic field through an exciting coil

The sum of all currents embraced by one line of magnetic field

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Magnetism and Electromagnetism
Ferrites are materials.

Diamagnetic

None of the listed here

Ferromagnetic

Paramagnetic

Diamagnetic

None of the listed here

Ferromagnetic

Paramagnetic

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

None of the listed here

Increases

Remain same

Decreases

None of the listed here

Increases

Remain same

Decreases

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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 Core of an electromagnet should have

Magnetism and Electromagnetism Main causes of noisy solenoid are

Magnetism and Electromagnetism The magnetomotive force is

Magnetism and Electromagnetism Ferrites are materials.

Magnetism and Electromagnetism A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

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
Core of an electromagnet should have

Magnetism and Electromagnetism
Main causes of noisy solenoid are

Magnetism and Electromagnetism
The magnetomotive force is

Magnetism and Electromagnetism
Ferrites are materials.

Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will