A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rN are connected as shown in the figure below. The current I in the circuit is 

(1) 0.51 amp

(2) 5.1 amp

(3) 0.15 amp

(4) 1.5 amp

(4) i=E1+E2+E3+.....+En(r1+r2+r3+.......+rn)

=1.5(r1+r2+r3+......+rn)(r1+r2+r3+.....+rn)=1.5A.

Difficulty Level:

  • 25%
  • 15%
  • 20%
  • 40%