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A technician has only two resistance coi...

A technician has only two resistance coils. By using them in series or in parallel he is able to obtain the resistance 3,4,12 and 16 ohm. The resistance of two coils are

A

6,10

B

4,12

C

7,9

D

4,16

Text Solution

Verified by Experts

The correct Answer is:
B
`R_(1) = (R_(s) + sqrt(R_(s)^(2) - 4R_(s)R_(p)))/2`
`R_(2) =(R_(s) - sqrt(R_(s)^(2)-4R_(s)R_(p)))/2`
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