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  • The ratio of the equivalent resistance of the network (shown in figure) between the points when switch is open and switch is closed is <img alt="x: 8." src="http

The ratio of the equivalent resistance of the network (shown in figure) between the points a$ and $b when switch is open and switch is closed is x: 8. The value of x is__________.
 

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Switch 's' is closed

           

(R_{ab})_{closed}= \frac{4R}{3}                 ...........(1)

Switch 's' is open

(R_{ab})_{open }= \frac{3R}{2}                    .............(2)

\frac{(R_{ab})_{open }}{(R_{ab})_{closed }}= \frac{3R/2}{4R/3}= \frac{9}{8}

\therefore x= 9

Posted by

vishal kumar

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