1.

The circuit has resistors of equal resistance R. The equivalent resistance between A and B, when key is closed is `R_1` and when key is open is `R_2`. Find the ratio `R_1 and R_2` . A. `11//12`B. `2//5`C. `1//5`D. none of these

Answer» Correct Answer - B
b. A careful observation will reveal that one end of each resistor is
connected to A and the other end of each resistor is connected
to B. Hence, resistors are in parallel.
`R_(eq) = R//5`
When the key is open, current will pass through resistance 1
and 2 only, which are in parallel. `R_(eq) = R//2`


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