Moving Charges And Magnetism Mock Tests

A long straight wire carries current I. The magnetic field at distance r from the wire is:

A long straight wire carries a current of 5 A. The magnetic field at a distance of 10 cm from the wire is (μ₀ = 4π × 10⁻⁷ T·m/A):

Two parallel wires carry currents in the same direction. The force between them is:

A particle of mass m and charge q is projected with velocity v into a uniform magnetic field B perpendicular to its velocity. The particle moves in a circular path of radius r. If the velocity is doubled and the charge is halved, the new radius will be:

Two long straight parallel wires carry currents I₁ and I₂ in the same direction. If I₁ = 2I₂, the force per unit length between them is attractive with magnitude:

A charged particle moves undeflected in a region having both uniform electric field E and magnetic field B. If the speed of the particle is v, then:

A long straight wire carries a current of 10 A. The magnetic field at a distance of 5 cm from the wire is:

Two long straight parallel wires carry currents I₁ and I₂ in the same direction. If I₁ = 2I₂, the force per unit length between them is: