NEET Physics Bar Magnet MCQ Question
A short bar magnet has a magnetic moment of 5.25 × 10⁻² J T⁻¹ and is placed with its axis perpendicular to the earth’s field direction. If the magnitude of the earth’s field is 0.42 G, at what distance from the center of the magnet on its axis will the resultant field be inclined at 45° with the earth's field?
5.47 cm
7.89 cm
9.30 cm
12.45 cm
Correct Answer
Detailed Explanation
Using the formula for the magnetic field of a bar magnet and the given inclination, the distance can be calculated. The resultant field forms a 45° angle when the field due to the magnet is equal to the earth's magnetic field.
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