Magnetism and Electromagnetism Multiple Choice Questions

Magnetism and Electromagnetism

Question 1.

Which of the following is a vector quantity?

A.

 Relative permeability

B.

 Magnetic field intensity

C.

 Flux density

D.

 Magnetic potential

Explanation :

Explanation Not Provided

Question 2.

What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

A.

 2,400 At

B.

 240 At

C.

 24 At

D.

 2.4 At

Explanation :

Explanation Not Provided

Question 3.

Magnetism of a magnet can be destroyed by

A.

 heating

B.

 hammering

C.

 by inductive action of another magnet

D.

 by all above methods

Explanation :

Explanation Not Provided

Question 4.

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

Explanation :

Explanation Not Provided

Question 5.

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

A.

 18.75 At

B.

 30 At

C.

 300 At

D.

 187 At

Explanation :

Explanation Not Provided

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