Solve
Guides
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Standard XII
Physics
Ferromagnetism
Question

Assertion : Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets.
Reason : Permanent magnet can be made by placing a ferromagnetic rod in a solenoid and passing current through it.
  1. If both assertion and reason are true and reason is the correct explanation of assertion.
  2. If both assertion and reason are true and reason is not the correct explanation of assertion.
  3. If assertion is true but reason is false.
  4. If both assertion and reason are false.

A
If assertion is true but reason is false.
B
If both assertion and reason are true and reason is the correct explanation of assertion.
C
If both assertion and reason are true and reason is not the correct explanation of assertion.
D
If both assertion and reason are false.
Open in App
Solution
Verified by Toppr

The correct option is B If both assertion and reason are true and reason is not the correct explanation of assertion.
To make a permanent magnet, place a ferromagnetic rod in a solenoid and pass a current through it. The magnetic field of the solenoid magnetises the rod.

Was this answer helpful?
0
Similar Questions
Q1
Assertion :Substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Reason: Permanent magnet can be made by placing a ferromagnetic rod in a solenoid and passing current through it.
View Solution
Q2
(i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution
Q3
Assertion: 3 + 7 = 9 is a statement.
Reason: A sentence that can be judged to be true or false, but not both, is called a statement.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution
Q4

Assertion: If a≠b, then (a,b)≠(b,a).
Reason: (4,−3) lies in Quadrant IV
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

View Solution
Q5
Assertion: An infinite number of lines can be drawn to pass through a given point.
Reason: A line segment has two end-points.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
View Solution