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Question (1)

QN0036422

What happens when electric current flows through a straight conductor?

(A) It produces a magnetic field around the conductor
(B) It produces only heat
(C) It produces only light
(D) It produces no effect

Correct Answer: A

Explanation:

A current-carrying conductor produces a magnetic field around it.

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Question (2)

QN0036423

Who discovered the magnetic effect of electric current?

(A) Newton
(B) Oersted
(C) Faraday
(D) Fleming

Correct Answer: B

Explanation:

Oersted discovered that a current-carrying wire deflects a compass needle.

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Question (3)

QN0036424

What is a magnetic field?

(A) Region around a magnet where magnetic force can be detected
(B) Region where only electric force acts
(C) Region without any force
(D) Region of high temperature

Correct Answer: A

Explanation:

A magnetic field is the region around a magnet where its magnetic force can be detected.

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Question (4)

QN0036425

Outside a bar magnet, magnetic field lines emerge from which pole?

(A) South pole
(B) North pole
(C) Both poles only
(D) Neutral point

Correct Answer: B

Explanation:

Magnetic field lines emerge from the north pole and enter the south pole outside the magnet.

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Question (5)

QN0036426

Inside a bar magnet, magnetic field lines are directed from:

(A) North to south
(B) South to north
(C) East to west
(D) West to east

Correct Answer: B

Explanation:

Inside the magnet, field lines travel from south pole to north pole.

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Question (6)

QN0036427

Why can two magnetic field lines never intersect each other?

(A) They are always parallel
(B) A compass needle would have two directions at one point
(C) They have different lengths
(D) They have different colours

Correct Answer: B

Explanation:

At an intersection, the magnetic field would have two directions, which is impossible.

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Question (7)

QN0036428

What does a region with closely spaced magnetic field lines indicate?

(A) Weak magnetic field
(B) Strong magnetic field
(C) No magnetic field
(D) Uniform temperature

Correct Answer: B

Explanation:

Closer magnetic field lines indicate a stronger magnetic field.

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Question (8)

QN0036429

The magnetic field lines around a straight current-carrying conductor are:

(A) Straight parallel lines
(B) Concentric circles
(C) Elliptical lines
(D) Random lines

Correct Answer: B

Explanation:

The field lines around a straight current-carrying conductor are concentric circles.

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Question (9)

QN0036430

If the direction of current through a straight conductor is reversed, the magnetic field:

(A) Becomes zero
(B) Remains unchanged
(C) Reverses its direction
(D) Doubles in magnitude

Correct Answer: C

Explanation:

Reversing current reverses the direction of the magnetic field.

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Question (10)

QN0036431

What happens to the magnetic field around a straight conductor when the current is increased?

(A) It decreases
(B) It increases
(C) It becomes zero
(D) It remains unchanged

Correct Answer: B

Explanation:

Increasing current increases the strength of the magnetic field.

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Question (1)

What happens when electric current flows through a straight conductor?

Explanation:

Link:

Question (2)

Who discovered the magnetic effect of electric current?

Explanation:

Link:

Question (3)

What is a magnetic field?

Explanation:

Link:

Question (4)

Outside a bar magnet, magnetic field lines emerge from which pole?

Explanation:

Link:

Question (5)

Inside a bar magnet, magnetic field lines are directed from:

Explanation:

Link:

Question (6)

Why can two magnetic field lines never intersect each other?

Explanation:

Link:

Question (7)

What does a region with closely spaced magnetic field lines indicate?

Explanation:

Link:

Question (8)

The magnetic field lines around a straight current-carrying conductor are:

Explanation:

Link:

Question (9)

If the direction of current through a straight conductor is reversed, the magnetic field:

Explanation:

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Question (10)

What happens to the magnetic field around a straight conductor when the current is increased?

Explanation:

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