Q1PhysicsUnit 10: Oscillations and Waves
f a positively charged pendulum is oscillating in a uniform electric field as shown in Figure. Its
time period of SHM as compared to that when it was uncharged.
Physics · JEE
Simple pendulum: derivation of expression for its time period Short Tricks for JEE
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Quick answer
Short tricks for Simple pendulum: derivation of expression for its time period work only with strong fundamentals. Apply the tips below in timed sets and review every explanation.
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Simple pendulum: derivation of expression for its time period focus drill
Solve 15 mixed MCQs for Simple pendulum: derivation of expression for its time period, review every explanation, and note formulas you hesitated on.
Dimensional check first
Before solving, verify each term has consistent SI dimensions — eliminates wrong options quickly in JEE MCQs.
Limiting cases
Substitute extreme values (t→0, m→∞, θ→0) to sanity-check your final expression.
Syllabus context
Part of Oscillations and Waves in JEE Main Physics.
- Oscillations and periodic motion: time period, frequency, displacement as a function of time, periodic functions
- Simple harmonic motion (S.H.M.) and its equation, phase
- Oscillations of a spring: restoring force and force constant
- Energy in S.H.M.: kinetic and potential energies
- Simple pendulum: derivation of expression for its time period
- Wave motion, longitudinal and transverse waves, speed of the travelling wave, displacement relation for a progressive wave
- Principle of superposition of waves, reflection of waves, standing waves in strings and organ pipes, fundamental mode and harmonics, beats
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Q2PhysicsUnit 10: Oscillations and Waves
Assertion
The bob of a simple pendulum is a ball full of water. If a fine hole is made in the
bottom of the ball, the time period first increases and then decreases.
Reason
As water flows out of the bob the weight of bob decreases.
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