Grade 12Electric Current
Two cells A and B of e.m.f 1.3 V and 1.5 V resp are arranged as shown in the figure. The voltmeter reads 1.45 V. The voltmeter is assumed to be ideal. Then show that r 1 = 3 r2 .
1 Answer
Ramesh V
Let I be current in circuit and E1=1.3V and E2=1.5V and E = 1.45V
by kirchoffs laws
(E2-E1)-I(R1+R2) = 0
and E = E2 - IR2
so , 0.05 = IR2 .........(1)
0.20=I(R1+R2) .........(2)
on solvine above 2 eqns, we have R1 = 3R2
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regards
Ramesh
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