What happens to magnetic needle if it is placed near an electric current?

What happens to magnetic needle if it is placed near an electric current?

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. So, when electric current passes through a wire, it behaves like a magnet. This is the magnetic effect of the electric current.

What can affect the needle in a compass?

Exposure to strong magnets, or magnetic interference can sometimes cause the magnetic poles of the compass needle to differ or even reverse.

What happens to the magnetic needle when?

When a magnetic needle is brought closer to a current-carrying conductor then the magnetic needle it gets deflected because the magnetic field of the current-carrying conductor exerts a force on the magnetic needle, making it move from one direction to the other.

What happens to the deflection of needle when current in the conductor is increased?

(a) Deflection increases when current through conductor increases.

Why does the needle on a compass point north?

The north pole of a compass magnet points toward the north. Earth’s south magnetic pole is near Earth’s geographic north. Earth’s magnetic north pole is near Earth’s geographic south. That’s why the north pole of a compass points toward north because that’s where Earth’s south magnetic pole is located and they attract.

What is a compass needle for?

The compass needle is a little steel magnet balanced upon a pivot; one end of the needle, which always bears a distinguishing mark, points approximately, but not in general exactly, to the north,’ the vertical plane through the direction of the needle being termed the magnetic meridian.

Why does the compass needle deflect?

Bar magnet The compass needle is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected near the magnet bar.

Why does a compass needle?

A compass needle points north because the north pole of the magnet inside it is attracted to the south pole of Earth’s built-in magnet. Since unlike poles attract, the thing your compass is being attracted to must be a magnetic south pole.

What happens to the deflection of needle when current in the conductor is decreased?

General Science (c) For a given current, if we move the compass needle away from the wire, its deflection decreases. This shows that the magnitude of the magnetic field produced by a given current in the wire is inversely proportional to the distance from the wire.

Why does the direction of deflection of the needle changes when the direction of current is reversed through a copper wire?

When current passes through the wire the compass needle comes to rest in a direction along the Earths magnetic field. When placed just below the wire, North Pole of the compass needle deflects towards the east when current is passes from B to A i.e. on reversing the direction of current.

Why does a compass needle always point north to south?

Wherever you are on Earth, the magnetized needle of a compass will always point in the same direction. This occurs because of Earth’s magnetism. Earth behaves like a gigantic magnet. Like a magnet, it is surrounded by a magnetic field.

Where does the needle of a compass point?

A magnetic compass points to the earth’s magnetic poles, which are not the same as earth’s geographic poles. Furthermore, the magnetic pole near earth’s geographic north pole is actually the south magnetic pole. When it comes to magnets, opposites attract.

What happens to the needle of a compass when current flows?

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.

Who first noticed the deflection of the compass needle?

Hans Christian Oersted was the first person who noticed the deflection of compass needle every time the current was passed through the wire. When an electric current flows through a wire, it behaves like a magnet. A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet.

How to connect a compass to an electric cell?

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.

How to make a magnetic compass at home?

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.