2. How many minimum number of 2Ω、resistance can beconnected to have

1.	2. How many minimum number of 2Ω、resistance can beconnected to have an effective resistance of 15SOdisha IEE 2008)
Answer» Ans :- Consider 3 two ohm resistances in series R effective=2+2+2=6 ohms Now consider a 4th 2 ohm resistance in parallel to this effective therefore 1/Rnet=1/6+1/2 1/Rnet=4/6 Rnet=1.5 ohms

2. How many minimum number of 2Ω、resistance can beconnected to have an effective resistance of 15SOdisha IEE 2008)

Answer»

Ans :- Consider 3 two ohm resistances in series

R effective=2+2+2=6 ohms

Now consider a 4th 2 ohm resistance in parallel to this effective

therefore

1/Rnet=1/6+1/2

1/Rnet=4/6

Rnet=1.5 ohms