Explanation
The magnetic force pulls the vehicle
The forces on AD and BC are zero because magnetic field due to a straight wire on AD and BC is parallel to elementary length of the loop.
Cyclotron is suitable for accelerating heavy particles like protons, α-particles etc., and not for electrons because of low mass. Because electrons acquire very high velocities very neat to velocity of light, appreciable variation in their mass occurs.
A moving charge experiences a force in magnetic field. It is because of interaction of two magnetic fields, one which is produced due to the motion of charge and other in which charge in moving.
In the absence of the electric current, the free electrons in a conductor are in a state of random motion, like molecule in a gas. Their average velocity is zero, i.e. they do not have any net velocity in a direction. As a result, there is no net magnetic force on the free electrons in the magnetic field. On passing the current, the free electrons acquire drift velocity in a definite direction, hence magnetic force acts on them, unless the field has no perpendicular component.
Due to metallic frame the deflection is only due to current in a coil and magnetic field, not due to vibration in the strings. If string starts oscillating, presence of metallic frame in the field makes these oscillations damped.
The direction of magnetic field due to current carrying conductor can be found by applying right hand thumb rule or right hand palm rule. When electric current is passed through a circular conductor, the magnetic field lines near the center of the conductor are almost straight lines. Magnetic flux direction is determined only by the direction of current.
We know that. the direction of the earth’s magnetic field is towards north and the velocity of electron is vertically downward. Applying Fleming’s left hand rule, the direction of force is towards west, Therefore, and electron coming from outer space will be deflected towards west.
In the case of metallic rod, the charge carriers flow through whole of the cross section. Therefore, the magnetic field exists both inside as well as outside.
However magnetic field inside the rod will go on decreasing as we go towards the axis.
MRI uses resonance of magnetic field due to spin of hydrogen nucleus with external magnetic field.
According to Fleming’s left hand rule, the direction of magnetic field is towards the East.
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