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A frame CDEF is placed in a region where a magnetic field $\vec{B}$ is present. A rod of length one metre moves with constant velocity 20 m/s and strength of magnetic field is one tesla. The power spent in the process is (take $R = 0.2 Ω$ and all other wires and rod have zero resistance)

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detailed solution

Correct option is B

e=BlvRPower=e2R=B2l2v2R=l2l2×2020.2=4002=2000W=2KW

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A frame CDEF is placed in a region where a magnetic field B→ is present. A rod of length one metre moves with constant velocity 20 m/s and strength of magnetic field is one tesla. The power spent in the process is (take R=0.2 Ω and all other wires and rod have zero resistance)

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

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A frame CDEF is placed in a region where a magnetic field $\vec{B}$ is present. A rod of length one metre moves with constant velocity 20 m/s and strength of magnetic field is one tesla. The power spent in the process is (take $R = 0.2 Ω$ and all other wires and rod have zero resistance)