Question

How is the direction of a magnetic field at a point determined?

Answer 1

Hint: In this, we find out of the magnet field at a point determined using field lines of the magnet. Field lines are used to show the direction of the field lines which are generated by the magnet. They also show the path of the magnetic force. Using these lines we can easily find the magnetic force and magnetic field.

Complete answer:
So we have given the determined point where we have to find the direction of a magnetic field.
As we know in the Magnet, magnetic field lines are emitted from the North Pole and unite at the South Pole.
Properties of Magnetic field lines:
Magnetic field lines exit from the North- Pole and unite at South-Pole.
The strength of the magnetic field is shown by the degree of closeness of the field lines. The field is stronger where the field lines are dense.
Magnetic lines do not cross each other.
The field lines of the magnet can be traced out with the use of a compass. Needle of the compass is a permanent magnet and the north indicator of the compass is a magnetic north pole. The North pole of a magnet will try to line up with the magnetic field, so a suspended compass needle will rotate until it lines up with the magnetic field. The magnetic poles attract, so the north indicator of the compass will point toward the south pole of a magnet. To respond to the earth's magnetic field, the compass will point toward the North Pole of the Earth because it is a magnetic south pole.
 A Magnetic field line is a path along which a free north-pole tends to move. To determine the path of a magnetic field need to place a small compass needle. The North - pole of the compass specifies the path of a magnetic field at that point.

Note:
To understand the compass we know about the magnetic properties of the magnet. According to the properties of the magnet, these field lines always go to the North Pole and the South Pole. The North - pole of the compass shows the path of a magnetic field at that point. If you know about these rules then you can easily solve this question.