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Q)

The pole strength of a $12\;cm$ long bar magnet is $2.0 \; Am$. The magnetic induction at a point $10\;cm$ away from the centre of the magnet on the axial line is : <br> $\begin{pmatrix} \frac{\mu_0}{4 \pi}= 10^{-7} Hm^{-1} \end{pmatrix}$


( A ) $2.2 \times 10^3 T$
( B ) $2.2 \times 10^{-2} T$
( C ) $1.1 \times 10^{-4} T$
( D ) $1.1 \times 10^{-2} T$

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