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Q.

When n cells are connected either in series or in parallel the strength of current is same. If external resistance is R and internal resistance of cell is r then

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a

R = nr

b

R=rn

c

R=n2R

d

R = r

answer is A.

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Detailed Solution

Current in series combination is 

is=nER+nr

Current in parallel combination is 

ip=nEnR+r

from the condition given in question 

is=ip⇒nER+nr=nEnR+r

On solving 

R=r

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