| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion [A]: A compass needle when placed on the magnetic north pole of the Earth rotates in vertical direction. |
| Reason (R): The Earth has only horizontal component of its magnetic field at the north poles. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: D
Solution :
(d) The Earth has only vertical component of its magnetic field at the magnetic poles. Since compass needle is only free to rotate in horizontal plane. At north-pole the vertical component of Earth's field will exert torque on the magnetic needle so as to align it along its direction. As the compass needle can not rotate in vertical plane. It will rest horizontally, when placed on the magnetic north pole of the Earth.
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