In circuit shown below, the resistance are given in ohms and the battery is assumed ideal with emf equal to 3 volt The voltage across the resistance `R_(4)` is

Options

A. `0.4 V`
B. `0.6 V`
C. `1.2 V`
D. `1.5 V`

Answer

A

Explanation

`R_(eq) = 75 Omega, i= (3)/(75) = (1)/(25) A`
`i_1 =(1)/(2)i=(1)/(50) A`
`p.d` across `20 Omega, V_1 = (1)/(50) xx 20 = (2)/(5) V = 0.4 V`
`0.4 V = p.d across (R_4 = 30 Omega)`.