Questions
Fig. shows three similar lamps L1, L2, and L3
connected across a power supply. If the lamp L3. fuses, how will the light emitted by L1, and L2, change ?
detailed solution
Correct option is B
Let R be the resistance of each lamp. If E be the applied the circuit I, is given byi1=ER+(R/2)=2E3RCurrent flowing through L2 or L3=122E3R=E3RWhen L3 is fused, the whole current flows through L1 and L2. Thusi2=E2RSo, current through L1 decreases and through L2 increases.Talk 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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