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

(c ) When each bulb is glowing at full power
current from each bulb `= I' = (50)/(100) = (1)/(2) A`
So main current `i= (n)/(2) A`
Also `E = V + ir implies 120 = 100 + ((n)/(2)) xx 10 implies n = 4`