An electromagnet has:

An electromagnet crane is carrying the electromagnet with the help of the three cables. But the electromagnet is not stable because of the wind. What is science behind the cause?

A

The wind is making the net force of the body equal to a non-zero value

B

The wind is making the net force of the body equal to zero value

C

The wind is making the net force of the body equal to a non-zero value but is supporting the equilibrium

D

The wind is making the net force of the body equal to zero value and supporting equilibrium

The electric current of an electromagnet is switched off then the magnetic property of the electromagnet will-

A

Remain for few moment

B

Vanish instantly

C

Will decrease with time for long

D

Will increase with time for long

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

A

The current source

B

The magnetic field

C

The lattice structure of the material of the rod

D

The induced electric field due to the changing magnetic field

In wideline NMR spectrometers, which of the following has to be supplied to the electromagnet?

A

Slowly varying low voltage

B

Rapidly varying low voltage

C

Slowly varying scan voltage

D

Rapidly varying scan voltage

The core of an electromagnet is made of soft iron because soft iron has

A

small susceptibility and small retentivity

B

large susceptibility and small retentivity

C

large density and large retentivity

D

small density and large retentivity

A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

A

0.1 A

B

1000 A

C

10:00 AM

D

100 A

E

None of the above

The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

A

2500 AT/m

B

250 AT/m

C

25 AT/m

D

2.5 AT/m

The electromagnet has?

A

Soft iron core

B

Steel core

C

Nickel core

D

Copper core

An electromagnet is created--------electrical current through a coil of wire.

A

by passing

B

passes by

C

to be passed

D

passed

Strength of an electromagnet can be increased by

A

increasing the cross-sectional area

B

increasing the number of turns

C

increasing current supply

D

all above methods

An electromagnet has:

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