question_answer

A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by [BHU 1998; JIPMER 2001, 02; CBSE PMT 2001]

A)            2.0 ohm                                  

B)            0.25 ohm

C)            1.0 ohm                                  

D)            0.5 ohm