Title: वैकल्पिक

Text: When electric current flows through a wire, a magnetic field is produced around the wire. You can detect this magnetic field on a straight wire, but when you coil the wire around a core, the magnetic fields of the wire-coils overlap and add, so the magnetic force intensifies. This produces an electromagnet. प्रत्येक पराग्राफले परीक्षण हुनेछ।

Save test: यदि तपाईं यो टाइपिङ परीक्षणलाई साझा गर्न चाहानुहुन्छ भने यो प्रयोग गर्नुहोस् (केवल प्रमाणीकृत प्रयोगकर्ताहरूको लागि)।