When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is
-
A.
(frac{R}{4}) -
B.
(frac{R}{3}) -
C.
(frac{R}{2}) -
D.
2(frac{R}{3}) -
E.
R
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