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  • A 20 cm long metallic rod is rotated with 210 rpm about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constan

A 20 cm long metallic rod is rotated with 210 rpm about an axis normal to the rod passing through its one end.
The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field 0.2 T
parallel to the axis exists everywhere. The emf developed between the centre and the ring is ______ mV.

(Take \pi = 22/7)

Option: 1

88


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\begin{aligned} & \omega=210 \times \frac{\pi}{30} \\ & =7 \pi=22 \mathrm{rad} / \mathrm{s} \\ & \mathrm{emf}=\mathrm{e}=\frac{1}{2} \mathrm{~B} \omega(\ell)^2 \\ & =\frac{1}{2} \times 0.2 \times 22 \times(0.2)^2 \\ & =\frac{11}{125} \mathrm{~V}=88 \mathrm{mV} \end{aligned}                        

Posted by

Kuldeep Maurya

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