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Current Electricity — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
Question
For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  1. Both A and R are true, and R is the correct explanation of A.
  2. Both A and R are true, but R is not the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, and R is also false.
Assertion: Two electric bulbs of 50 and 100 watt are given. When connected in series 50 watt bulb glows more but when connected in parallel 100 watt bulb glows more.
Reason: In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
✓

Answer

  1. Both A and R are true, and R is the correct explanation of A.

Explanation:

Resistance of 50 watt bulb is two times the resistance of 100 watt bulb. When bulbs are connected in series, 50 watt bulb will glow more as P = i2R (current remains same in series). ln parallel, the 100 watt bulb will glow more as $\text{P}=\frac{\text{V}^2}{\text{R}}$ (potential difference remain same in parallel).

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