Physics by Dhiman Sir

🧠 Can you solve this buoyancy MCQ? 🌊⚖️

Two immiscible liquids + a spherical body — find the fraction of the sphere immersed in the upper liquid.
Answer: Option B ✅

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🧠 Can you solve this buoyancy MCQ? 🌊⚖️

Two immiscible liquids + a spherical body —

find the fraction of the sphere immersed in the upper liquid.

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🌊🪨 How Can Floods Carry Huge Boulders? — The Physics Behind It!

High-density slurry + high velocity = enormous drag force. ⚡

From P ~ v³ to reduced effective weight, fluid mechanics explains how powerful floodwaters

can move massive rocks downstream! 💥
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⚡ Steady-State Capacitor Trick!

In DC steady state, capacitors act as open circuits. For this circuit, the voltage across C₁ = 0 V. Can you spot why? 🔋⚡
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⚡ Three parallel current-carrying wires —

can you find the condition for zero net force on the middle wire? 🤔🔬

Think • Analyse • Apply • Succeed! 🚀
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⚡ Irodov Problem — Electrostatics Meets SHM!
A charged ball above a conducting plane: use the image-charge method, find the effective gravity, and discover the charge that halves the pendulum period.

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⚡ Can you crack this capacitor circuit?

A symmetric resistor network makes the two capacitor terminals equipotential in steady state. Can you identify the correct answer without doing lengthy calculations? 🧠🔋

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Can you find the equivalent resistance R(AB)?
A symmetric-looking circuit, but the capacitor makes the analysis interesting! 🔌🧠

Try solving it before checking the answer.
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🐦⚡ Why is a bird usually safe on a power wire?

It’s not the huge current in the wire that matters—
it’s the potential difference across the bird’s body. On a good conducting wire, both feet are nearly at the same potential, so almost no current flows through the bird. But if the wire has significant resistance, a voltage difference can develop between its feet—and that can be dangerous.

Physics is all about potential difference! ⚡📚
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⚡ Charge on a Capacitor in Steady State
In this 12 V resistor network, the 2 μF capacitor is charged to a potential difference of 4 V, giving
Q=CV= 8 micro Coulomb