Icse Class 10 Physics May 2026

“Now,” Grandfather said, “if I spin this motor by hand, the opposite happens.” The coil spun inside the magnetic field, and a small bulb connected to it flickered. “,” he smiled. “A changing magnetic field induces a current. This is how the lighthouse generator works – Faraday’s Law .” Part 4: The Signals of the Sky (Spectrum and Sound) The lighthouse lamp worked, but the foghorn was silent. Anya adjusted a tuning fork. It vibrated, producing sound – a longitudinal wave of compressions and rarefactions.

Suddenly, the bulb got blazing hot and died. “Too much current,” Grandfather said. “Remember : V = I × R . For a fixed resistor, if voltage (V) goes up, current (I) goes up. But here, heat increases resistance, creating a non-ohmic failure.”

– the rules of the climb. Current Electricity – the flow that powers the world. Electromagnetism – the invisible force turning motion into light. Spectrum & Sound – the messengers through air and void. Radioactivity – the dangerous, powerful heart of matter. icse class 10 physics

She powered the coil. It became a magnet, repelling the permanent magnet, and the motor jerked to life. This was the : a current-carrying wire in a magnetic field experiences a force .

“When , it becomes an electromagnet ,” Grandfather said. “The direction of the magnetic field? Use the Right-Hand Thumb Rule – curl your fingers in the direction of current, your thumb points north.” “Now,” Grandfather said, “if I spin this motor

They pushed. The trolley moved slowly. Anya realized she was doing (force × displacement). When they paused midway, the trolley had potential energy because of its height. When it rolled down a small dip, that energy converted to kinetic energy .

“Too faint,” Grandfather said. “Measure it.” This is how the lighthouse generator works –

Anya was scared. “It’s poisonous.”