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Pre-Medical: Physics57.In a network as shown in the figure the potentialdifference across the resistance 2R is (the cell hasan emf E with no internal resistance):(1) 2EAE74R2R7(4) E

Answer»

Total resistance of the circuit is R + (4R*2R)/(4R+2R) = R + 8R/6 = R+4R/3 = 7R/3

now, current = E/(7R/3) = 3E/7R

now P.D across 2R = E - R*i = E-3E/7 = 4E/7

option 2



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