Question -
The effective resistance between points P and Q of the electrical circuit shown in figure is
Options:
A .  2Rr(R+r)
B .  8R(R+r)(3R+r)
C .  2r + 4R
D .  5R2+2r
Answer: Option A : A The branches ABPQ and PQCD are a balanced Wheatstone's bridge. Therefore resistances between E and E and between F and G do not contribute and the circuit simplies to the one show in figure. The effective resistanceRe between P and Q is given by 1Re=14R+12r+14R which gives Re=2Rr(R+r)
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