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Question (21)

QN0036442

The magnetic field inside a long solenoid is approximately:

(A) Non-uniform and circular
(B) Uniform and represented by parallel straight lines
(C) Zero everywhere
(D) Random

Correct Answer: B

Explanation:

The field inside a solenoid is uniform and represented by parallel straight field lines.

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Question (22)

QN0036443

The magnetic field of a solenoid resembles that of:

(A) A bar magnet
(B) A battery
(C) A resistor
(D) A fuse

Correct Answer: A

Explanation:

A current-carrying solenoid behaves like a bar magnet.

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Question (23)

QN0036444

Which material is commonly used as the core of an electromagnet?

(A) Soft iron
(B) Wood
(C) Glass
(D) Plastic

Correct Answer: A

Explanation:

A soft iron core can be magnetised effectively to form an electromagnet.

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Question (24)

QN0036445

An electromagnet can be made by placing a soft iron core inside:

(A) A current-carrying solenoid
(B) A glass tube without wire
(C) A battery alone
(D) A fuse wire alone

Correct Answer: A

Explanation:

A soft iron core placed inside a current-carrying solenoid forms an electromagnet.

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Question (25)

QN0036446

What happens when a current-carrying conductor is placed in a magnetic field?

(A) It experiences a magnetic force
(B) It always becomes electrically neutral
(C) It stops conducting
(D) It loses all resistance

Correct Answer: A

Explanation:

A magnetic field exerts a force on a current-carrying conductor.

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Question (26)

QN0036447

The force on a current-carrying conductor in a magnetic field depends on:

(A) Current and magnetic field
(B) Colour of conductor only
(C) Mass only
(D) Temperature only

Correct Answer: A

Explanation:

The force depends on the current in the conductor and the magnetic field.

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Question (27)

QN0036448

When is the force on a current-carrying conductor in a magnetic field maximum?

(A) When current and field are parallel
(B) When current and field are perpendicular
(C) When there is no current
(D) When the field is zero

Correct Answer: B

Explanation:

The force is maximum when the conductor and magnetic field are at right angles.

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Question (28)

QN0036449

Which rule determines the direction of force on a current-carrying conductor placed in a magnetic field?

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

Correct Answer: B

Explanation:

Fleming's left-hand rule determines the direction of force.

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Question (29)

QN0036450

In Fleming's left-hand rule, the forefinger represents the direction of:

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

Correct Answer: B

Explanation:

The forefinger points in the direction of the magnetic field.

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Question (30)

QN0036451

In Fleming's left-hand rule, the middle finger represents the direction of:

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

Correct Answer: B

Explanation:

The middle finger represents the direction of current.

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Question (21)

The magnetic field inside a long solenoid is approximately:

Explanation:

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Question (22)

The magnetic field of a solenoid resembles that of:

Explanation:

Link:

Question (23)

Which material is commonly used as the core of an electromagnet?

Explanation:

Link:

Question (24)

An electromagnet can be made by placing a soft iron core inside:

Explanation:

Link:

Question (25)

What happens when a current-carrying conductor is placed in a magnetic field?

Explanation:

Link:

Question (26)

The force on a current-carrying conductor in a magnetic field depends on:

Explanation:

Link:

Question (27)

When is the force on a current-carrying conductor in a magnetic field maximum?

Explanation:

Link:

Question (28)

Which rule determines the direction of force on a current-carrying conductor placed in a magnetic field?

Explanation:

Link:

Question (29)

In Fleming's left-hand rule, the forefinger represents the direction of:

Explanation:

Link:

Question (30)

In Fleming's left-hand rule, the middle finger represents the direction of:

Explanation:

Link:

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