0
What if a magnetic needle is kept in a non uniform magnetic field?
Wiki User
∙ 11y ago
A magnetic needle kept in uniform magnetic field will experience zero net force but non-zero net torque........Since the magnetic lines are uniform,the force acting on each end of the needlewill be equal and opposite.So it will cancel each other resulting zero net force.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Why are magnets kept in the keepers?
when magnets are kept loose their magnetic power becomes weak. therefore a non magnetic substance should be kept in between of two magnets while storing them. so that there is no continuous attraction or repulsion between them.
What gives earth its magnetic force field?
in 1872 3 scientists dug to the earths core and implanted an electro magnet more powerful than an atomic bomb. The government kept all this secret so that no one could disrupt the magnet's current.
What will happen to a compass needle when an aluminium bar is kept in between them?
Providing that there are no ferrous materials present - nothing. Do not depend on it though.
How are magnets destroyed?
Ferromagnetism can be impaired by creating an opposing magnetic field. A wire coil placed around a magnet creates an electromagnetic field. If this is aligned in the opposite direction, it could eventually remove the intrinisic field of the permanent magnet.In many cases, simply heating a magnet would likewise remove the magnetic field.Use a degaussing coil (driven by AC, not DC). Gradually reduce the field strength either by reducing the AC current or slowly separating the coil and the object.
What is the saturation of a permanent magnet?
Saturation is an effect by which any increase in mangetising force produces a feable improvement in magnetic property if the magnetising force is increased beyond a certain limit. This is analogous to the stress-strain curve of a material obeying Hooke's law. Saturation is of serious concern in electrical engineering that when a Current transformer with a certain ampere rating is fed from a high current source at primary(than it can carry) , the unit can respond at secondary upto the max. magnetic flux carrying capacity of the core and if at such a condition, the secondary if kept open, can produce an unopposed m.m.f which would consequently produce heating of the core and in some cases to the exploding of the CT unit. The classical equation that relates magnetism with electricity is H x l= NI which can be used for theoretical calculation of mangetic field intensity with a given ampere turn. However, saturation for an artificial permanent magnet is the max. value of H upto which is can be magnetised, in spite of being exposed to a strong magnetic field for a specific duration.
Why does the current carrying conductor experiences a force when it is placed in magnetic field state Fleming's left hand rule?
The force on current carrying conductor kept in a magnetic field is given by the expression F = B I L sin@ So the force becomes zero when the current carrying conductor is kept parallel to the magnetic field direction and becomes maximum when the current direction is normal to the magnetic field direction. Ok now why does a force exist on the current carrying conductor? As current flows through a conductor magnetic lines are formed aroung the conductor. This magnetic field gets interaction with the external field and so a force comes into the scene.
Why and when does a current carrying conductor kept in a magnetic field experiences a force list factor on which the direction of this force depend State the rule which may be used to determine the di?
Current carrying conductor will have magnetic lines around it. So when it is kept perpendicular to the magnetic field then the force would be maximum. The force depends on 1. magnitude of current 2. Magnetic field induction 3. Angle between the direction of current and magnetic field. Fleming's Left hand rule is used to find the direction of force acting on the rod
Which are defected by electric and magnetic fields?
Any charged particle in motion especially not parallel to the magnetic field, current carrying conductor kept inclined or perpendicular to the magnetic field would get deflected. As far as electric field is concerned, even stationary charges would be displaced.
Dead beat in magnetic compass used in aircraft?
Trying to keep oscillations of the compass at a minimum, the mass of the magnetic assembly is kept as close as possible to the suspension needle. There are also compasses with damping wires.
Does a current carrying conductor experience a force when kept parallel to the magnetic field?
Yes. The force attracts the conductor to the magnetic field, F= eVB = e(-V.B + VxB) = e[-V.B, ] =- eV.B when V and B are parallel!
Why does current carrying conductor experience force when kept near a magnet?
The current carrying conductor has a magnetic field of of its own so when it comes in contact with with another magnetic field it experiences a force which is given by fleming's left hand rule.The force depends upon :direction and the strength of the magnetic fielddirection and the strenth of the current
Which principle is used in a DC motor?
Current carrying conductor kept in a magnetic field gets deflected. This is the basic principle. In short Lorentz force causes the rotation
What is the reason when the current is switched on through a wire a compass needle kept nearby is defected from its north-south position?
You've just repeated one of the important experiments of Dr. Ampere, the 19th Century French physicist. A current flowing through a wire produces a magnetic field around the wire.It's as simple as that. The field is exactly the same thing as the magnetic field that exists in the space around a bar magnet or a horseshoe magnet, or around the earth. If you hang up a small magnet on a string and bring your current-carrying wire near it, you'll see forces between the magnet and the wire that try to pull them together or push them apart. The compass needle is just a magnet on a low-friction pivot point; the needle tries to line up with the 'lines' of the earth's magnetic field, which happen to run roughly north-south. The lines of the field around a wire are in rings around the wire. Here's how you tell which direction is 'north' in the field around the wire: The 'direction' of the current in the wire is the direction from the positive end to the negative end. Make a 'hitch-hiker's' fist with your right hand ... curl the fingers and stick the thumb out. Now curl the fingers around the wire with your thumb pointing in the direction of the current in the wire ... away from the positive end, toward the negative end. Your fingers are the magnetic field lines around the wire, and the fingers point in the direction of 'north'.
What parts of a hypodermic setup must be kept sterile?
needle
Why are steel and iron kept together?
Steel and iron are magnetic objects. Why are they kept together ?
What is the relation between electricity and magnetism?
Due to the flow of electric charges ie current flow, a magnetic field is produced. Hence a moving electric charge in the region where magnetic field is present then a force acts on the moving charged particle. This is due to the interaction between the magnetic field due to flowing charge and the magnetic field present. Same way as a current carrying conductor is kept in a magetic field then a force is acting on the conductor. Even magnetism is produced due to the electrons going around the nucleus as well as the spin of the electrons. So with the configuration of electrons we have three magnetic materials such as dia, para and ferro.
Why the generator field rheostat kept at maximum position?
There is nothing to limit current until opposing magnetic fields build up at generator operating speed-windings will overheat and burn.
