The effective resistance of three equal resistances, each of resistance r, connected in parallel, is

Options

A. `3//r`
B. `r//3`
C. 3r
D. `r^(3)`

Answer

B

Explanation

Let the effective resistance of three equal resistance, each of resistance r, connected parallel is R
Then `(1)/(R)=(1)/(r)+(1)/(r)+(1)/(r)=(3)/(r).`
`:." "R=(r)/(3)`