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  • In the arrangement shown in Figure, when the switch  is open, the galvanometer shows no defle

In the arrangement shown in Figure, when the switch \mathrm{S_2} is open, the galvanometer shows no deflection for = /2. When the switch \mathrm{S_2}  is closed, the galvanometer shows no deflection for = 5/21. The internal resistance () of 6 V cell, and the e.m.f. of the other battery are respectively

Option: 1

3 Ω, 8 V 


Option: 2

2 Ω, 12 V 


Option: 3

2 Ω, 24 V 


Option: 4

3 Ω, 12 V


Answers (1)

best_answer

When switch \mathrm{S_1}  is open

\mathrm{ \frac{6}{E}=\frac{L}{2} / L=\frac{1}{2} \\ }

\mathrm{ \therefore E=12 \mathrm{~V} }

When switch \mathrm{ S_2 }  is closed, we get

\mathrm{ \frac{6 \times 10}{10+r}=\frac{5 L}{12 L} E=\frac{5}{12} \times 12=5 \\ }

\mathrm{ \therefore 10+r=12 \text { or } r=2 \Omega }
 

Posted by

HARSH KANKARIA

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