vertical ring of radius r and resistance R 48. A resistor of resistance R. an in

Question

vertical ring of radius r and resistance R 48. A resistor of resistance R. an inductor of inductance L and a capacitor of resistance Horizontal unvem manetic field of magnitude B ring and rails exists. When the speed of ring is V, the surrent in the section PO is instantt-Q, switch is soddenly shifiod to 2, the current in the ciouit afiler a time 22 downwards 111.74 4) butery as shown in figune. Posential difference betwoen a and b is zene in steady state if firoquency and a fised voltage amplitade The curont amplinule in the cin

Explanation / Answer

46.Motional emf induced between the rails and ring is E=B.2r.V ;i.e. E=2BrV.So current flows through the ring as I =2BrV/R.But as the ring moves opposite of PQ ,current through PQ is zero.so option 1) is correct.

48.Voltage develop across one RC combination in time to is V1=Vo.(1-exp(-t/R1C1)) and across second RC circuit is V2=Vo.(1-exp(-t/R2C2)) .But in steady V1=V2 so R1C1=R2C2

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