Icse Class 10 Physics ~repack~ May 2026

But the radio signal to trigger the foghorn came through empty space. “That’s an ,” he said. “No medium needed.”

“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. 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 . But the radio signal to trigger the foghorn

Anya was scared. “It’s poisonous.” “,” he smiled

She used the gamma source to check for cracks in the lighthouse wall (a real-world application). The detector clicked rapidly where the wall was thin. At sunrise, the Lighthouse of Shattered Cove shone bright. The foghorn boomed. The radio sent its signal. The backup battery was charged.