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Magnetism and Electromagnetism

Study 85 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

A magnetic field exists around________?

Acopper

Bmoving charges

Caluminium

Diron

Correct answer

B. moving charges

Explanation

The correct answer is moving charges.

32Electrical EngineeringMedium

The materials are a bit inferior conductors of magnetic flux than air

Adielectric

Bdiamagnetic

Cparamagnetic

Dferromagnetic

Correct answer

B. diamagnetic

Explanation

The correct answer is diamagnetic.

33Electrical EngineeringMedium

How does the magnetic compass needle behave in a magnetic field?

AIt assures a position right angle to magnetic field

BNone of the above

CIt starts rotating

DIt assures a position which follows a line of magnetic flux

Correct answer

D. It assures a position which follows a line of magnetic flux

Explanation

The correct answer is It assures a position which follows a line of magnetic flux.

34Electrical EngineeringMedium

Which of the following is the unit of magnetic flux density?

Atesla

Blumens

Cnone of the above

Dweber

Correct answer

A. tesla

Explanation

The correct answer is tesla.

35Electrical EngineeringMedium

A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be________?

A24 N

B2.4 N

C0.24 N

D240 N

Correct answer

B. 2.4 N

Explanation

The correct answer is 2.4 N.

36Electrical EngineeringMedium

Out of the following statements, concerning an electric field, which statement is not true?

AUnit field intensity in the exertion of a force of one newton on a charge of one coulomb

BThe electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

CThe electric intensity is a vector quantity

DAn electric field is defined as a point in space at which an electric charge would experience a force

Correct answer

B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

Explanation

The correct answer is The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point.

37Electrical EngineeringMedium

When an iron piece is placed in a magnetic field________?

Athe magnetic lines of force will bend away from their usual paths in order to go away from the piece

Bthe iron piece will break

Cthe magnetic field will not be affected

Dthe magnetic lines of force will bend away from their usual paths in order to pass through the piece

Correct answer

D. the magnetic lines of force will bend away from their usual paths in order to pass through the piece

Explanation

The correct answer is the magnetic lines of force will bend away from their usual paths in order to pass through the piece.

38Electrical EngineeringMedium

The attraction capacity of electromagnet will increase if the________?

Acore area increases

Bflux density decreases

Ccore length increases i

Dflux density increases

Correct answer

D. flux density increases

Explanation

The correct answer is flux density increases.

39Electrical EngineeringMedium

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

Aequal to that of disc and in the same direction

Bless than that of disc but in opposite direction

Cless than that of disc and in the same direction

Dequal to that of disc and in the opposite direction

Correct answer

C. less than that of disc and in the same direction

Explanation

The correct answer is less than that of disc and in the same direction.

40Electrical EngineeringMedium

A material which is slightly repelled by a magnetic field is known as________?

Aparamagnetic material

Bconducting material

Cdiamagnetic material

Dferromagnetic material

Correct answer

C. diamagnetic material

Explanation

The correct answer is diamagnetic material.

How does the magnetic compass needle behave in a magnetic field?

AIt assures a position right angle to magnetic field

BNone of the above

CIt starts rotating

DIt assures a position which follows a line of magnetic flux

Correct answer

D. It assures a position which follows a line of magnetic flux

Explanation

The correct answer is It assures a position which follows a line of magnetic flux.

Out of the following statements, concerning an electric field, which statement is not true?

AUnit field intensity in the exertion of a force of one newton on a charge of one coulomb

BThe electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

CThe electric intensity is a vector quantity

DAn electric field is defined as a point in space at which an electric charge would experience a force

Correct answer

B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

Explanation

The correct answer is The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point.

When an iron piece is placed in a magnetic field________?

Athe magnetic lines of force will bend away from their usual paths in order to go away from the piece

Bthe iron piece will break

Cthe magnetic field will not be affected

Dthe magnetic lines of force will bend away from their usual paths in order to pass through the piece

Correct answer

D. the magnetic lines of force will bend away from their usual paths in order to pass through the piece

Explanation

The correct answer is the magnetic lines of force will bend away from their usual paths in order to pass through the piece.

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?

Aequal to that of disc and in the same direction

Bless than that of disc but in opposite direction

Cless than that of disc and in the same direction

Dequal to that of disc and in the opposite direction

Correct answer

C. less than that of disc and in the same direction

Explanation

The correct answer is less than that of disc and in the same direction.