you are given "n" resistors of resistance R .these are connected first to get the minimum possible resistance,then connected to get maximum possible resistance .Then the ratio between minimum to maximum is (A)1/n^2 (1/n square) (B)1/n (C)n (D)n^2 (n square)

Asked by  | 10th May, 2011, 12:38: AM

Expert Answer:

For minimum  possible resistance, the resistors are connected in parallel,
1/rp = 1/r + 1/r + .....n times
or rp = r/n
 
For maximum possible resistance, the resistors are connected in series,
 
rs = r+r+..... n times
rs = nr
ratio = rp/rs = 1/n2
 

Answered by  | 9th May, 2011, 08:23: PM

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