wrap the wire around and around about 40 times to make a coil and cut it from the spool then wrap anoyher length of wire around the compass about 25 times and cut it from the spool. take all 4 free ends of the coils and connect them to make a complete circuit. this is the explanation and the question is : wave the magnet back and fourth through the center of the first coil you made - the one without the compass In it . keep an eye on the compass needle . what happens? please answer
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Answers
Answer:
Take the cardboard tray from inside a discarded matchbox. Wrap an electric wire a few times around the cardboard tray. Place a small compass needle inside it. Now connect the free ends of this wire to an electric cell through a switch.
Note the direction in which the compass needle is pointing. Bring a bar magnet near the compass needle. Observe what happens. Now, while watching the compass needle carefully, move the switch to the ‘ON’ position. Does the compass needle deflect? Move the switch back to the ‘OFF’ position. Does the compass needle come back to its initial position?
Repeat the experiment a few times. What does this experiment indicate?
We know that the needle of a compass is a tiny magnet, which points in north-south direction. When we bring a magnet close to it, the needle gets deflected. We have also seen that compass needle gets deflected when the current flows in a nearby wire. Can you connect the two observations? When the current flows through a wire, does the wire behave like a magnet?
This is what a scientist called Hans Christian Oersted also wondered. He was the first person who noticed the deflection of compass needle every time the current was passed through the wire.
So, when electric current passes through a wire, it behaves like a magnet. This is the magnetic effect of the electric current. In fact, an electric current can be used to make magnets. Do you find it to