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Following figure shows a metal rod PQ resting on the smooth ralls AH and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod 15 cm, B 0.50 T, resistance of the closed loop containing the rod `9.0 mOmega`. Assume the field to be uniform. Is there an excess charge built up at the ends of the rods when K is open? What if K is closed? |
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Answer» Given, length of the rod `l=15cm=15xx10^(-2)m` Magnetic field `B=0.50T` Resistance of the closed - loop containing the rod, `R=9mOmega=9xx10^(-3)Omega` Velocity of rod `V=12" cm/s "12 xx 106(-2) m//s.` Yes, an excess positive charge developes at P and the same amount of negative charge developes at Q as the key is open. When the key K is closed, the induced current flows and maintains the excess charge. |
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