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Tushar Watts Grade: 12
        

4063-1087_3899_dc9.bmp


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 .

7 years ago

Answers : (1)

Ramesh V
70 Points
										

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 = IR             .........(1)


      0.20=I(R1+R2)        .........(2)


on solvine above 2 eqns, we have R1 = 3R2 


--


regards


Ramesh

7 years ago
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