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A group of N cells of e.m.f. varying dir...

A group of N cells of e.m.f. varying directly with internal resistance as per equation `E_n = 1.5 r_n` are connected as shown in figure
. The current `I` in circuit is

A

1.5 A

B

0.15 A

C

5.1 A

D

0.51 A.

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