Electric bulb `50 W - 100 V` glowing at full power are to be used in parallel with battery `120 V`, `10 Omega`. Maximum number of bulbs that can be connected so that they glow in full power is

Options

A. 2
B. 8
C. 4
D. 6

Answer

C

Explanation

`R =(100)^(2)/50 = 200 Omega, i=50/100=1/2A`
Main current `i=n/2 A`
`E = V+ir rArr 120 = 100 + (n/2) xx 10 rArr n = 4`