defence exam BSF Head Constable (RO/RM) Mock Test 2023 Physics Electromagnetic Induction and Inductance Motional Electromotive Force
A metallic rod of length l is tied to a string of length 2l and made to rotate with angular speed ω on horizontal table with one end of the string fixed. If the induced emf across the ends of the rod is e, then the vertical magnetic field in the region is.
1
\(\frac {2e}{5l^2 \omega }\)
2
\(\frac {e}{5l^2 \omega }\)
3
\(\frac {2e}{3l^2 \omega }\)
4
\(\frac {2e}{l^2 \omega }\)