Table of Contents
Why do you put apparatus in east west direction?
Explanation: If you demagnetize a magnet either by heating it above the curie temperature or by a AC field which goes to 0, the magnet will catch up the magnetization of the environment. You may neutralize the earth magnetic field with coils, but just orienting the magnet east-west is simple.
Which direction will the wire be deflected when current flows through it in the magnetic field B?
When the key is pressed and current passes in the wire in the direction A to B (i.e. from south to north and the north pole (N) of the needle deflects towards the west as figure (b). Thus a current (or moving charge) produces a magnetic field.
Why does a current carrying freely suspended solenoid rest along a particular direction?
A current-carrying solenoid behaves like a bar magnet. We know that a freely suspended bar magnet aligns itself in the north-south direction. So, a freely suspended current-carrying solenoid also aligns itself in the north-south direction.
What is the direction of the current in the wire?
The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.
Why is magnetic needle used in compass?
Thus, in a compass, a magnetic needle is used to show the geographic north direction by aligning itself in the direction magnetic South-Pole of the Earth.
Why is the compass important?
The magnetic compass was an important advance in navigation because it allowed mariners to determine their direction even if clouds obscured their usual astronomical cues such as the North Star. The compass was invented by the Chinese, and was widely used for navigation beginning in about the thirteenth century.
Why does a current carrying wire deflect a compass needle?
A current carrying wire always produces a magnetic field around it and due to this magnetic field the needle of magnetic compass deflects.
Why does a current carrying wire cause a compass needle to move?
Every electric current produces magnetism. This electricity produced an area of magnetism around the wire called a magnetic field. Since the compass needle is also a magnet, the magnetic field around the wire attracted and repelled the ends of the compass magnet and caused it to move.
Can a freely suspended current carrying solenoid?
Explain. A current-carrying solenoid behaves like a magnet. When suspended freely, it will stay in a north-south direction. On reversing current its polarity will be reversed and so it will turn at 180°.
What happens when a current carrying wire is placed in a magnetic field?
Because the magnetic field created by the electric current in the wire is changing directions around the wire, it will repel both poles of the magnet by bending away from the wire.
Why is direction of current opposite to electrons?
Electrons being negatively charged flow from the negative terminal to the positive terminal of the voltage source. So, the actual direction of current should be from negative to positive terminal. So, the current flow is considered in the direction opposite to the direction of flow of electrons.