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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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