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Q.

The effective resistance in series combination of two equal resistance is ‘s’. When they are joined in parallel the total resistance is p. If s=np then the minimum possible value of ‘n’ is

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a

2

b

1

c

3

d

4

answer is A.

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Detailed Solution

S=nP

If the identical resistances are R, then 

⇒2R=n⋅R2

⇒n=4

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The effective resistance in series combination of two equal resistance is ‘s’. When they are joined in parallel the total resistance is p. If s=np then the minimum possible value of ‘n’ is