A) \[0.5656\times {{10}^{-3}}Nm\]
B) \[0.656\times {{10}^{-4}}N-m\]
C) \[0.5656\times {{10}^{-5}}Nm\]
D) \[0.5656\times {{10}^{-4}}N-m\]
Correct Answer: A
Solution :
Here: The length of the magnet\[=10\text{ }cm\] \[=0.1m\] Pole strength \[m=40\text{ }Am\] Angle \[\theta =45{}^\circ \] Field intensity\[B=2\times {{10}^{-4}}\]tesla The couple is given by \[\overline{L}=mlB\text{ }sin\theta \] \[=40\times 0.1\times 2\times {{10}^{-4}}\sin 45{}^\circ \] \[=8\times {{10}^{-4}}\times 0.707\] \[=0.5656\times {{10}^{-3}}N-m\]
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