Capacitor energy U = ½CV². If voltage doubled, energy becomes:
A. Double
B. Four times
C. Same
D. Half
Answer: Option B
Solution (By JKSSB Mock Tests)
U ∝ V². If V' = 2V, U' = 4U. Energy scales with square of voltage. Memory aid: 'Capacitor energy: U ∝ V²; double voltage ⇒ quadruple energy'. Electrostatics proportionality frequently tested in competitive exams.
Explanation:
R = ρL/A, depends on length (L), cross-sectional area (A), and resistivity (ρ) which depends on material and temperature. Not on colour or transparency.
Explanation:
Impulse = F Δt = Δp (change in momentum). Derived from Newton's second law. Force is rate of change of momentum. Impulse-momentum theorem important for collisions.
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