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Question (11)

QN0036432

What happens to the magnetic field around a straight conductor when the distance from it is increased?

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

Correct Answer: B

Explanation:

The magnetic field becomes weaker as the distance from the conductor increases.

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Question (12)

QN0036433

Which rule is used to determine the direction of the magnetic field around a straight current-carrying conductor?

(A) Fleming's left-hand rule
(B) Right-hand thumb rule
(C) Fleming's right-hand rule
(D) Lenz's law

Correct Answer: B

Explanation:

The right-hand thumb rule gives the direction of the magnetic field around a current-carrying conductor.

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Question (13)

QN0036434

In the right-hand thumb rule, the curled fingers represent the direction of:

(A) Current
(B) Magnetic field
(C) Force
(D) Motion

Correct Answer: B

Explanation:

The curled fingers show the direction of the magnetic field.

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Question (14)

QN0036435

Which two factors directly affect the magnetic field around a straight current-carrying conductor?

(A) Current and distance from the conductor
(B) Voltage and temperature only
(C) Mass and length only
(D) Colour and thickness only

Correct Answer: A

Explanation:

The magnetic field depends on the current and the distance from the conductor.

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Question (15)

QN0036436

At the centre of a current-carrying circular loop, the magnetic field due to different parts of the loop:

(A) Cancel completely
(B) Add in the same direction
(C) Have no effect
(D) Act randomly

Correct Answer: B

Explanation:

The magnetic field contributions at the centre add in the same direction.

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Question (16)

QN0036437

If the magnetic field produced by one turn of a coil is B, what is the field produced by 10 turns under the same conditions?

(A) B/10
(B) B
(C) 10B
(D) 100B

Correct Answer: C

Explanation:

For n turns, the magnetic field is n times that of one turn, so it is 10B.

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Question (17)

QN0036438

If one turn of a coil produces magnetic field B, what field is produced by 20 turns under the same conditions?

(A) 20B
(B) B/20
(C) 2B
(D) B

Correct Answer: A

Explanation:

Magnetic field is proportional to the number of turns, so field = 20B.

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Question (18)

QN0036439

The number of turns in a coil is increased from 5 to 15. Under the same conditions, the magnetic field becomes:

(A) One-third
(B) Three times
(C) Five times
(D) Fifteen times

Correct Answer: B

Explanation:

The number of turns increases threefold, so the magnetic field also becomes three times.

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Question (19)

QN0036440

The number of turns in a coil is reduced from 100 to 50. Under the same conditions, the magnetic field becomes:

(A) Twice
(B) Half
(C) Four times
(D) Unchanged

Correct Answer: B

Explanation:

The number of turns is halved, so the magnetic field is also halved.

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Question (20)

QN0036441

What is a solenoid?

(A) A single straight wire
(B) A coil of many circular turns of insulated wire wound closely in a cylinder
(C) A permanent magnet only
(D) A metal plate

Correct Answer: B

Explanation:

A solenoid consists of many closely wound circular turns of insulated copper wire in cylindrical form.

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Question (11)

What happens to the magnetic field around a straight conductor when the distance from it is increased?

Explanation:

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Question (12)

Which rule is used to determine the direction of the magnetic field around a straight current-carrying conductor?

Explanation:

Link:

Question (13)

In the right-hand thumb rule, the curled fingers represent the direction of:

Explanation:

Link:

Question (14)

Which two factors directly affect the magnetic field around a straight current-carrying conductor?

Explanation:

Link:

Question (15)

At the centre of a current-carrying circular loop, the magnetic field due to different parts of the loop:

Explanation:

Link:

Question (16)

If the magnetic field produced by one turn of a coil is B, what is the field produced by 10 turns under the same conditions?

Explanation:

Link:

Question (17)

If one turn of a coil produces magnetic field B, what field is produced by 20 turns under the same conditions?

Explanation:

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Question (18)

The number of turns in a coil is increased from 5 to 15. Under the same conditions, the magnetic field becomes:

Explanation:

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Question (19)

The number of turns in a coil is reduced from 100 to 50. Under the same conditions, the magnetic field becomes:

Explanation:

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Question (20)

What is a solenoid?

Explanation:

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