A) 0.05 T
B) 0.1 T
C) 0.2 T
D) 0.5 T
Correct Answer: C
Solution :
[c] : Here, \[m=50g=50\times {{10}^{-3}}kg;I=5.0A\] Tension in the wires is zero if the force on the rod due to magnetic field is equal and opposite to the weight of the rod. i.e.,\[mg=BIl\Rightarrow B=\frac{mg}{Il}\] Substituting the given values, we get \[B=\frac{50\times {{10}^{-3}}\times 10}{5\times 50\times {{10}^{-2}}}=0.2T\]You need to login to perform this action.
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