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Three resistors of 9 ohms each are connected in parallel. Their equivalent resistance is:
Question

Three resistors of 9 ohms each are connected in parallel. Their equivalent resistance is:

A.

27

B.

9

C.

18

D.

3

Correct option is D

The correct answer is (d) 3.

Solution-

  • The equivalent resistance of three resistors of 9 ohms each connected in parallel is less than the smallest resistor.
  • The expression for the equivalent resistance of three resistors connected in parallel is- 1/R= 1/R1 + 1/R2 + 1/R3 =1/9+1/9+1/9= 1/3 

Rp= 3 ohms

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