Question

Resistors pf 20 ohm , 20 ohm, and 30 ohm , are connected in parallel .what resistance must be added in series with the combination to obtain a total resistance of 10 ohm??

Answer 1

first find out the resistance effective of parallel combination den later let the resistor added be x.Now take the answer of the resistance effective of parallel combination n add x to it which is equal to 10.Later solve it u ll get the answer as 5/2

Answer 2

Answer:

5/2 or 2.5 ohm

Refer the attachment.

Hope it is clear.