Question
Science Question on Magnetic Effects of Current and Magnetism
Assertion (A): The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased.
Reason (R): Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.
A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
C
(A) is true, but (R) is false.
D
(A) is false, but (R) is true.
Answer
(A) is false, but (R) is true.
Explanation
Solution
The deflection of a compass needle increases, not decreases, when the current in the wire increases. This is due to the increased strength of the magnetic field produced by the current-carrying conductor.