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Electrical Power and Household Circuits — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsElectrical Power and Household Circuits1 Mark
MCQ
Which of the following is correct?
  • A
    As the radius of the filament wire increases the fuse temperature rises above its surrounding.
  • B
    As the radius of the filament wire increases the fuse temperature drops below its surrounding.
  • C
    As the current flowing through the filament wire increases the fuse temperature rises above its surrounding.
  • ✓
    Both (b) and (c) are correct.
✓

Answer

Correct option: D.
Both (b) and (c) are correct.
(d)
Both (b) and (c) are correct.
Explanation:
Options (b) and (c) can be checked by the following equation,
$
\Delta T \propto \frac{I^2}{r^2},
$
where $\Delta T$ is the temperature difference between the surrounding and the filament, I is the current flowing through the filament, and $r$ is the radius of the filament wire.

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