Question

Five bulbs with power rating $B_1=B_4=60W-200V,B_2=B_3=100W-200V$ and $B_5=40W-200V$ now, 200 V are connected as shown in figure. Then
1. $B_5$ will glow the most
2. $B_1$ will glow more than $B_4$
3. $B_2$ and $B_3$ will glow the most

• A. Only 1 is correct
• B. 1 and 2 are correct
• C. 1, 2, and 3 are correct
• D. None

Answer 1

The correct option is B 1 and 2 are correct


$R_1=R_n=\frac{{200}^2}{60}$
$R_2=R_2=\frac{{200}^2}{100}$
$R_5=\frac{{200}^2}{40}$
As $R_1+R_2+R_3<R_4+R_5\Rightarrow i_2>i_1$
So by power out put $P=i^{2}R\Rightarrow P_1>P_n$
As $R_2<R_1\Rightarrow P_1>P_2=P_3$
and $P_1<P_5$