Questions
Two heating coils, one of fine wire and the other of thick wire made of same material and of same length are first connected in series and then in parallel. Which of the following statements is correct?
detailed solution
Correct option is A
R1=ρlA1, R2=ρlA2 As A1 < A2 so R1 > R2In series H=I2Rt ⇒ H ∝ R ⇒ H1 > H2In parallel H=V2Rt ⇒ H ∝ 1R ⇒ H1 < H2Talk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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