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1. A two terminal black box contains one of the elements R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is
(A): capacitance of 0.5 F
(B): inductance
(C): not identifiable form the given data
(D): resistance
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