JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors Question Bank Heating Effect of Current

  • question_answer A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is       [CBSE PMT 1995]

    A)            200 J                                        

    B)            400 J

    C)            25 J

    D)            50 J

    Correct Answer: B

    Solution :

               When the heating coil is cut into two equal parts and these parts are joined in parallel, the resistance of coil is reduced to one fourth, so power consumed will become 4 times i.e. 400 Js?1.

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