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A coil of inductance 4 H and resistance 80 Ω is in parallel with a 200 Ω resistor of negligible inductance across a 200 V d.c. supply. The switch connecting these to the supply is then opened, the coil and resistor remaining connected together. State, in each case, for an instant immediately before and for one immediately after the opening of the switch: (a) the current through the resistor; (b) the current through the coil; (c) the e.m.f. induced in the coil; and (d) the voltage across the coil.

A coil of inductance 4 H and resistance 80 Ω is in
parallel with a 200 Ω resistor of negligible inductance
across a 200 V d.c. supply. The switch connecting
these to the supply is then opened, the coil and
resistor remaining connected together. State, in each
case, for an instant immediately before and for one
immediately after the opening of the switch: (a) the
current through the resistor; (b) the current through
the coil; (c) the e.m.f. induced in the coil; and (d) the
voltage across the coil.
 

Grade:12th pass

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