Q. 74.0( 1 Vote )
A straight wire carrying an electric current is placed along the axis of a uniformly charged ring. Will there be a magnetic force on the wire if the ring starts rotating about the wire? If yes, in which direction?
No, there won’t be any magnetic force acting on the wire in this case because, if the ring starts rotating, it will create a magnetic field which is parallel or antiparallel to the direction of current or the length vector of the wire at the center of the ring. i.e. angle between the is zero or ϖ respectively. According to F = ILBsinϴ
for ϴ = 0 or ϖ,
Here I is the current, L is the length of the wire and B is the magnitude of the magnetic field.
So, there will be no force on the wire if the ring starts rotating about the wire.
Rate this question :
An electron is moving along the positive x-axis. You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative x-axis. This can be done by applying the magnetic field along.HC Verma - Concepts of Physics Part 2
A charged particle is moved along a magnetic field line. The magnetic force on the particle isHC Verma - Concepts of Physics Part 2
The free electrons in a conducting wire are in constant thermal motion. If such a wire, carrying no current, is placed in a magnetic field, is there a magnetic force on each free electron? Is there a magnetic force on the wire?HC Verma - Concepts of Physics Part 2
Two wires carrying equal currents i each, are placed perpendicular to each other, just avoiding a contact. If one wire is held fixed and the other is free to move under magnetic forces, what kind of motion will result?HC Verma - Concepts of Physics Part 2
If a charged particle projected in a gravity-free room deflects,HC Verma - Concepts of Physics Part 2
You are facing a circular wire carrying an electric current. The current is clockwise a seen by you. Is the field at the centre coming towards you or going away from you?HC Verma - Concepts of Physics Part 2
The torque on a current loop is zero if the angel between the positive normal and the magnetic field is either θ = 0 or θ = 180°. In which of the two orientations, the equilibrium is stable?HC Verma - Concepts of Physics Part 2
The net charge in a current-carrying wire is zero. Then, why does a magnetic field exert a force on it?HC Verma - Concepts of Physics Part 2