Moving Charges and Magnetism

What is the direction of the magnetic force on a positive charge moving in a magnetic field?

The magnetic force on a charged particle moving parallel to a uniform magnetic field is:

A proton moves with velocity \( 2 \times 10^6 \ \text{m/s} \) perpendicular to a magnetic field of strength 0.5 T. What is the magnitude of the magnetic force acting on it? (Charge of proton \( e = 1.6 \times 10^{-19} \ C \))

Which of the following represents the magnetic field at a distance \( r \) from a long straight current-carrying wire?

A charged particle moves in a circular path in a uniform magnetic field. Which of the following quantities remains constant?

The radius \( r \) of the circular path of a charged particle moving in a magnetic field is given by:

In the context of Earth's magnetic field, the angle between the magnetic field and the horizontal plane at a location is called:

A particle with charge \( q \) and mass \( m \) moves in a uniform magnetic field \( B \) with velocity perpendicular to \( B \). The time period of its circular motion is:

Two long parallel wires separated by distance \( d \) carry currents \( I_1 \) and \( I_2 \) in the same direction. The force per unit length on each wire is:

A charged particle enters a region of uniform magnetic field with velocity at an angle \( \theta \) to the field. The particle's path is: