Exam 22: Magnetism

A charged particle moves with a constant speed through a region where a uniform magnetic field is present.If the magnetic field points straight upward,the magnetic force acting on this particle will be strongest when the particle moves

An electron,moving south,enters a magnetic field.Because of this field,the electron curves upward.We may conclude that the magnetic field must have a component

The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10^-3 T.How much current is flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A vertical wire carries a current vertically downward.To the east of this wire,the magnetic field points

Three very long,straight,parallel wires each carry currents of 4.0 A,directed out of the page as shown in the figure.These wires pass through the vertices of a right isosceles triangle as shown.Assume that all the quantities shown in the figure are accurate to two significant figures.What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? (μ₀ = 4π × 10^-7 T ∙ m/A)

A long straight wire on the z-axis carries a current of 8.0 A in the +z direction (out of the paper).A circular loop of radius 10 cm lies in the xy-plane and carries a 3.0-A current,as shown in the figure.Point P,at the center of the loop,is 25 cm from the z-axis.An electron is projected from P with a velocity of 3.0 × 10⁶ m/s in the -x direction.What is the y component of the magnetic force on the electron? (e = 1.60 × 10^-19,μ₀ = 4π × 10^-7 T ∙ m/A)

A wire is carrying current vertically downward.What is the direction of the force on this wire due to Earth's magnetic field?