A bar magnet is located in a uniform, constant magnetic field.
Is the magnetic field of a bar magnet uniform?
Here we will study about the Torque on a Bar Magnet in a Magnetic Field and Important Points related to it. When a bar magnet is placed in a uniform magnetic field the two poles experience a force. The forces are equal in magnitude and opposite in direction and do not have same line of action.
What is the direction of magnetic field around a bar magnet?
(a) If small compasses are used to map the magnetic field around a bar magnet, they will point in the directions shown: away from the north pole of the magnet, toward the south pole of the magnet. (Recall that the Earth’s north magnetic pole is really a south pole in terms of definitions of poles on a bar magnet.)
What is the force acting on a bar magnet placed in a uniform magnetic field?
The correct answer should be – Zero. When a bar magnet or magnetic dipole is placed in a uniform magnetic field, it will not experience any force but it is bound to experience a torque. This torque will align the dipole moment of the bar magnet to align along the direction of magnetic field.
How is the magnetic field of a bar magnet represented?
The magnetic field of a bar magnet can be represented pictorially by the ‘lines of force’ (or lines of ‘magnetic flux’ as they are called) as shown in Figure 10.1. Such a field pattern can be produced by placing iron filings in the vicinity of the magnet.
Where is the magnetic field of a bar magnet strongest?
The magnetic field generated by any magnet is always strongest at either pole. The magnetic force is equally as strong at both the north and south pole.
When a magnet is placed in a uniform magnetic field it experiences?
A magnetic needle placed in a uniform magnetic field experiences a torque but not a force. But in a non-unifomr magnetic field it experiences a torque as well as a force.
Where is the weakest area of magnetism on a magnet?
The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Is electromagnet a permanent magnet?
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Which bar is magnetic?
Alnico and Neodymium Bar Magnet
The primary components of Alnico magnets are aluminium, nickel, cobalt, and iron.
When a bar magnet is placed in a non uniform magnetic field?
Here we have seen the role of a non-uniform magnetic field but if a bar magnet is placed in a uniform magnetic field then the bar magnet will experience only a torque and no force and this torque will be acting on the both ends of the bar magnet and these torques will be equal but opposite in direction.
What is the torque when a bar magnet of dipole moment M is placed in a uniform magnetic field?
Torque is maximum if θ = 90 i.e. torque is maximum if the magnetic dipole is at right angles to applied magnetic field. Torque is minimum if θ = 0 i.e. torque is minimum if the magnetic dipole is along the direction of applied magnetic field.
How is radial magnetic field achieved in moving coil galvanometer?
Radial magnetic field is that field, in which the plane of the coil in all positions is parallel to the direction of the magnetic field. A radial magnetic field has been achieved by (i) properly cutting the magnetic pole pieces in the shape of concave faces. (ii) using a soft iron core within the coil.
What happens when a magnet is cut from the middle?
You can think of a magnet as a bundle of tiny magnets, called magnetic domains, that are jammed together. Each one reinforces the magnetic fields of the others. Each one has a tiny north and south pole. If you cut one in half, the newly cut faces will become the new north or south poles of the smaller pieces.
How do you calculate magnetic field?
The Biot-Savart Law can be used to determine the magnetic field strength from a current segment. For the simple case of an infinite straight current-carrying wire it is reduced to the form B=μ0I2πr B = μ 0 I 2 π r .
How magnetic field is created?
Any current (movement of electrical charge) will create a magnetic field. Certain materials are capable of realigning the angular momentum of their electrons, and iron is one of them. When the angular momentum of electrons gets aligned, an external magnetic field is created.