What is the torque acting on a bar magnet?

Torque on a bar magnet placed in an uniform magnetic field We can define couple as a pair of two equal and opposite forces having different lines of action. They give rise to turning effect known as torque along the axis which is perpendicular to the plane of forces.

Do magnetic fields cause torque?

A magnetic field exerts a force on a straight wire carrying current; it exerts a torque on a loop of wire carrying current. Torque causes an object to spin around a fixed axis. A magnetic field exerts a torque which tries to align the normal vector of a loop of current with the magnetic field.

Do magnets exert an electric field?

It is important to note that magnetic field will not exert a force on a static electric charge. These two observations are in keeping with the rule that magnetic fields do no work.

What does the magnetic field exert a force on?

Magnetic fields exert forces on moving charges. This force is one of the most basic known. The direction of the magnetic force on a moving charge is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1) as shown.

What is the necessary condition that the torque on a bar magnet due to the Earth’s magnetic field is maximum?

τ will be maximum if sin θ= maximum i.e. θ=90∘. Hence axis of the magnet is perpendicular to the field of earth.

What is the torque experienced by a magnetic dipole in a magnetic field?

So the angle between the area vector and the magnetic field will be zero and finally, the torque will be zero.

Does magnetic torque do work?

The sum of the work done by the magnetic forces on the charges of a system (which includes work done by magnetic torques) is always zero, but the work done by the sum of the magnetic forces on the charges (which changes the translational kinetic energy) can be nonzero.

How is magnetic moment related to torque?

As the coil turns, the direction of the magnetic moment turns with it. If the magnetic field is unchanging, then the rotation of the magnetic moment will cause the torque to reverse direction, which means the torque cause the loop to accelerate the opposite direction.

How does a bar magnet generate a magnetic field?

Magnets are different because the molecules in magnets are arranged so that their electrons spin in the same direction. This arrangement and movement creates a magnetic force that flows out from a north-seeking pole and from a south-seeking pole. This magnetic force creates a magnetic field around a magnet.

How is a magnetic field different from an electric field?

An electric field is essentially a force field that’s created around an electrically charged particle. A magnetic field is one that’s created around a permanent magnetic substance or a moving electrically charged object.

Why does a magnetic field exert a force on a moving electron?

Under certain conditions, electric current causes a magnetic field. A moving charged particle creates a magnetic field around it. Additionally, when a moving charged particle moves through a different magnetic field, the two magnetic fields will interact. The result is a force exerted on the moving charged particle.

What is the difference between the magnetic field and the magnetic force of a magnet?

Therefore magnetic force is defined as, “The force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.” The space or the region around a magnet within which magnetic force is exerted on other magnet is called the magnetic field.

Does a magnet exert a force or torque on itself?

It won’t exert a net force or torque on itself, but the various parts of it will exert forces and torques on each other, so it will typically be under mechanical stress. Does a current carrying circular loop or bar magnet exert a torque on itself due to its own field justify your answer?

What is the cross product of magnetic moment and magnetic field?

As the magnetic field B is due to the magnetic moment M the value of cross product will be zero. ∵ θ = 0 Magnetic poles exist in pairs. However one can visualize, theoretically, magnetic field due to three poles formed by placing the north poles of the two magnets in contact and the south poles separated by some distance.

Can magnetic field lines be entirely confined within a toroid?

(a) Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why? (b) Does a bar magnet exert a torque on itself due to its own field? Justify (a) Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.

What happens when a magnet is suspended in air?

If a bar magnet is suspended in the air so that it is free to rotate about its center, it will rotate to align itself with the magnetic field of the Earth, or with anything in the immediate vicinity (such as a large mass of ferromagnetic material) offering a stronger magnetic attraction.