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Q69 (NDA-II/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) Official Key

In which one among the following situations, the bulb ⊗ would glow the most? (Consider all batteries are the same)

Explanation

The brightness of an electric bulb depends on the electrical power it dissipates, which is governed by the formula P = V²/R (where P is power, V is voltage, and R is the resistance of the bulb).

  • In Option A, two bulbs in series increase the total resistance, leading to lower current and dimmer light.
  • In Option B, bulbs in parallel receive the same voltage as a single bulb, but do not exceed the source voltage.
  • In Option C, a single battery provides a standard voltage (V).
  • In Option D, two batteries connected in series provide double the voltage (2V) to the single bulb. Since power is proportional to the square of the voltage, the power dissipation increases fourfold compared to a single battery circuit, making the bulb glow the most.
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