Q. 14.6( 11 Votes )
Suppose a charged particle moves with a velocity v near a wire carrying an electric current. A magnetic force, therefore, acts on it. If the same particle is seen from a frame moving with velocity v in the same direction, the charge will be found at rest. Will the magnetic force become zero in this frame? Will the magnetic field become zero in this frame?
Answer :
Formula used:
The magnetic force is given by
Where F is magnetic force
q is electric charge =
v is velocity
Angle between magnetic force and velocity component
A Charge particle is moving near a conducting wire. And also a frame is moving in the same direction which the charge is moving. Seeing from the frame it is known that the charge is at rest. So velocity of the charge particles will be zero. Thus magnetic force will be zero.
When the charge is at rest the current will be zero. We don’t know either it is a positive or negative charge. Let us consider it is a negative charge. Seeing from the frame negative charge is at rest. But there is a positive charge flow. Due to this magnetic field will exists. So the magnetic field should not be zero.
Rate this question :
Equation of electric and magnetic field52 mins
Magnetic force on moving charge particle in magnetic field | Quiz32 mins
Magnetic force on moving charge particle in magnetic field44 mins
Magnetic field due to current carrying straight wire37 mins
Magnetic field due to current carrying circular loop36 mins
Superfast Revision of Potential & Potenial Energy (Theory + Interactive Quiz)47 mins
Few Applications of Gauss's law54 mins
Electric field inside cavity37 mins
Gain Confidence on Magnetic Effects of Current with Questions41 mins
Test Your Knowledge of Electric Charge & Coulomb's Law47 mins
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 2A charged particle is moved along a magnetic field line. The magnetic force on the particle is
HC Verma - Concepts of Physics Part 2The 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 2Two ions have equal masses but one is singly ionized and the other is doubly ionized. They are projected from the same place in a uniform magnetic field with the same velocity perpendicular to the field.
HC Verma - Concepts of Physics Part 2Two 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 2If a charged particle projected in a gravity-free room deflects,
HC Verma - Concepts of Physics Part 2You 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 2The 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 2The 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