Magnetism Class-9 Exe-10B MCQs Concise Physics ICSE Selina Solutions Ch-10. In this article you would learn to solve MCQS on Electromagnet and its Uses. Visit official Website CISCE for detail information about ICSE Board Class-9 Physics.

Magnetism Exe-10B MCQs Concise Physics ICSE Class 9 Selina Publishers

Board	ICSE
Class	9
Subject	Physics
Writer / Publication	Concise Selina Publishers
Chapter-10	Magnetism
Exe-10B	Electromagnet and its Uses
Topics	Solution of Exe-10B MCQs
Academic Session	2025-2026

Electromagnet and its Uses

Magnetism Exe-10B MCQs Concise Physics ICSE Class 9 Selina Publishers Solutions

Page 235  (Choose the correct answer from the options given below).

Que-1: As electromagnet is a temporary strong magnet made from :

(a) steel
(b) aluminium
(c) copper
(d) soft iron

Ans: (d) soft iron
Hint- An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet.

Que-2: Look at the figure and answer the following questions:

(i) The end P becomes:
(a) south pole
(b) north pole
(c) cannot say
(d) none of the above
(ii) The end Q becomes:
(a) south pole
(b) north pole
(c) cannot say
(d) none of the above
(iii) The given bar shows magnetic properties only when …………… through the solenoid and it loses the magnetic properties as soon as the ……………
(a) current is switched off, current is switched on
(b) current is switched on, current is switched off
(c) current is switched on, current is switched on
(d) both (a) and (b)

Ans: 
(i) (a) south pole
(ii) (b) north pole
(iii) (b) current is switched on, current is switched off
Hint-
(i) When current is passed through the winding of the solenoid by closing the key K, the end P of the bar becomes the south pole, since current at this face is clockwise.
(ii) When current is passed through the winding of the solenoid by closing the key K, the end Q of the bar becomes the north pole, since current at this face is anticlockwise.
(iii) The bar shows magnetic properties only when an electric current flows through the solenoid and it loses the magnetic properties as soon as the current is switched off (since soft iron has low retentivity), thus it is a temporary magnet.

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Page 236

Que-3: The magnetic field of an electromagnet can be increased by …………… in the solenoid and by ……………through the solenoid.

(a) increasing the number of turns, decreasing the current.
(b) decreasing the number of turns, increasing the current.
(c) decreasing the number of turns, decreasing the current.
(d) increasing the number of turns, increasing the current.

Ans:  (d) increasing the number of turns, increasing the current
Hint- The strength of a magnet can be increased by —

1. Increasing the number of turns of windings in the solenoid.
2. Increasing the current through the solenoid.

Que-4: Which of the following statements are correct ?

(i) An electromagnet produces a permanent magnetic field.
(ii) An electromagnet can produce a strong magnetic field.
(iii) The polarity of electromagnet can be reversed by reversing the direction of current in the solenoid.
(a) all of the above
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) and (iii)

Ans: (c) (ii) and (iii)
Hint- The correct statements for an electromagnet are :

1. An electromagnet can produce a strong magnetic field.
2. The polarity of electromagnet can be reversed by reversing the direction of current in the solenoid.

Que-5: The strength of an electromagnet can be increased by:

(a) reversing the directions of current
(b) using alternating current of high frequency
(c) increasing the current in the coil
(d) decreasing the number of turns of coil

Ans: (c) increasing the current in the coil
Hint- The strength of electromagnet can be increased by increasing the current in the coil.

Que-6: A soft iron piece is in the form of a closed ring (no free ends). A wire is wound over it to make it an electromagnet. What happens when current is passed in the wire ?

(a) It does not get magnetised.
(b) It gets temporarily magnetised.
(c) It becomes magnetised.
(d) It can be magnetised if broken into two parts.

Ans: (c) It becomes magnetised
Hint- When the current flows through the soft iron piece in the form of a closed ring, it becomes magnetised. The north and south poles will be present on opposite sides of the ring.

Que-7: Which of the following devices does not use an electromagnet ?

(a) Magnetic compass
(b) Electric fan
(c) Relay
(d) Microphone

Ans: (a) Magnetic compass
Hint- A permanent magnet is used to make a magnetic compass.

Que-8: The magnetic polarity at the two ends of a horse-shoe magnet depends on :

(a) the strength of current in the coil
(b) the number of turns in the coil
(c) the material on which the coil is wound
(d) the direction of current at the ends of the magnet.

Ans: (d) the direction of current at the ends of the magnet.
Hint- The magnetic polarity at the two ends of a horse-shoe magnet depends on the direction of current at the ends of the magnet.

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