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Question
Consider a magnetic dipole kept in the north to south direction. Let P1, P2, Q1, Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same at
(a) P1 and P2
(b) Q1 and Q2
(c) P1 and Q1
(d) P2 and Q2
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Solution
(a) P1 and P2
(b) Q1 and Q2
We know that magnetic field lines are directed from the north pole to the south pole. From the given figure, we can say that the direction of magnetic field `vecB` is the same only at points P1 and P2 and at points Q1 and Q2.
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