Four resistances `10 Omega, 5 Omega, 7 Omega` and `3 Omega` are connected so that they form the sides of a rectangle `AB, BC, CD` and `DA` respectively. Another resistance of `10 Omega` is connected across the diagonal `AC`. The equivalent resistance between `A` and `B` is

Options

A. `2 Omega`
B. `5 Omega`
C. `7 Omega`
D. `10 Omega`

Answer

B

Explanation

(b) The figure can be drawn as follows:
`implies R_(AB) = 5 Omega`.