1.

The dipole moment of a short bar magnet is 1.25 A-m2. The magnetic field on its axis at a distance of 0.5metre from the centre of the magnet is

A.            \[1.0\times {{10}^{-4}}Newton/amp-meter\]
B.            \[4\times {{10}^{-2}}Newton/amp-metre\]
C.            \[2\times {{10}^{-6}}Newton/amp-metre\]
D.            \[6.64\times {{10}^{-8}}Newton/amp-metre\]
Answer» D.            \[6.64\times {{10}^{-8}}Newton/amp-metre\]


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