Question 4 - MCQs from NCERT Exemplar - Chapter 13 Class 10 - Magnetic Effects of Electric Current

Last updated at Dec. 13, 2024 by Teachoo

For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is:

Answer:

Properties of magnetic field produced in a solenoid:

A solenoid behaves like a bar magnet when current is passed through it.
The field lines are parallel straight lines inside a solenoid which indicates that the magnetic field is uniform inside a solenoid.
Magnetic field produced in a solenoid is very strong and hence they are used to make electromagnets.
When direction of current is reversed i n a solenoid, the north and south poles are exchanged.

Checking the options:

(a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid - This is correct.
(b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil - This is correct.
(c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet - This is incorrect, because a solenoid behaves like a bar magnet when electricity is passed through it.
(d) The N and S-poles exchange position when the direction of current through the solenoid is reversed - This is correct.

So, the correct answer is (c)