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Calculate the value of the resistance of R in the circuit shown in the so that the current in the circuit is 0.2A .What would be the potential difference between points B and E ? (##CHY_DMB_PHY_XII_P1_U02_C02_E23_001_Q01.png" width="80%"> |
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Answer» Let R = equivalent resistance between B and E . Then,`(1)/(r)=(1)/(30)+(1)/(10)+(1)/(15)=(1+3+2)/(30)=(6)/(30)=(1)/(5)` i . e ,`r=5Omega` `THEREFORE` The potential differnce between points B and E `Ir=0.2xx5=1V` Effective emf of the CIRCUIT= 8- 3 = 5 V `therefore0.2=(5)/(15+R+5)=(5)/(20+R)` `"or," 4+0.2R=5` ` "or," R=(5-4)/(0.2)=5Omega` |
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