Points A and B are situated along the extended axis of a \( 2 \math...

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Points A and B are situated along the extended axis of a \( 2 \mathrm{~cm} \) long bar magnet at a distance \( x \) and \( 2 x \mathrm{~cm} \)
\( \mathrm{P} \) respectively from the pole nearer to the points. The

W ratio of the magnetic field at \( \mathrm{A} \) and \( \mathrm{B} \) will be
(1) \( 4: 1 \) exactly
(2) \( 4: 1 \) approx.
(3) \( 8: 1 \) exactly
(4) \( 8: 1 \) approx.
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