A) \[0.656\times {{10}^{-5}}\,\,N\text{-}m\]
B) \[0.656\times {{10}^{-4}}\,\,N\text{-}m\]
C) \[0.5656\times {{10}^{-4}}\,\,N\text{-}m\]
D) \[0.5656\times {{10}^{-3}}\,\,N\text{-}m\]
Correct Answer: C
Solution :
Length of the magnet\[l=10\,\,cm\] \[m=40\,\,Am\] The strength\[m=40\,\,Am\] Angle\[\theta ={{45}^{o}}\] Induction\[B=2\times {{10}^{-4}}tesla\] Couple is\[\tau =mlB\sin \theta \] \[=40\times 0.1\times 2\times {{10}^{-4}}\sin {{45}^{o}}\] \[=8\times {{10}^{-4}}\times 0.707=0.5656\times {{10}^{-4}}N\text{-}m\]You need to login to perform this action.
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