Exam 22: Magnetism

A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines.Ignoring the particle's weight,the particle will

A long,straight,horizontal wire carries current toward the east.A proton moves toward the east alongside and just south of the wire.What is the direction of the magnetic force on the proton?

The direction of the force on a current-carrying wire in a magnetic field is

A long,straight wire carrying a current is placed along the y-axis.If the direction of the current is in the +y direction,what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?

A flat rectangular loop of wire is placed between the poles of a magnet,as shown in the figure.It has dimensions w = 0.60 m and L = 1.0 m,and carries a current I = 2.0 A in the direction shown.The magnetic field due to the magnet is uniform and of magnitude 0.80 T.The loop rotates in the magnetic field and at one point the plane of the loop is perpendicular to the field.At that instant,what is the magnitude of the torque acting on the wire due to the magnetic field?

A wire carrying a current is shaped in the form of a circular loop of radius 4.0 mm.If the magnetic field strength at its center is With no external magnetic fields present,what is the magnitude of the current flowing through the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A flat rectangular loop of wire is placed between the poles of a magnet,as shown in the figure.It has dimensions w = 0.60 m and L = 1.0 m,and carries a current I = 2.0 A in the direction shown.The magnetic field due to the magnet is uniform and of magnitude 0.80 T.The loop rotates in the magnetic field and at one point the plane of the loop makes a 30° angle with the field.At that instant,what is the magnitude of the torque acting on the wire due to the magnetic field?

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.What are the signs of the charges of these three particles?

A rectangular coil,with corners labeled ABCD,has length L and width w.It is placed between the poles of a magnet,as shown in the figure If there is a current I flowing through this coil in the direction shown,what is the direction of the force acting on section AB of this coil?

A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire.To measure a field of 5 mT due to this wire,you would have to go to a distance from the wire of

An electron moves with a speed of 8.0 × 10⁶ m/s along the +x-axis.It enters a region where there is a magnetic field of 2.5 T,directed at an angle of 60° to the +x-axis and lying in the xy-plane.Calculate the magnitude of the magnetic force on the electron.(e = 1.60 × 10^-19C)

A straight wire is carrying a current of 2.0 A.It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T.If the wire experiences a force of 0.40 N,what is the length of the wire?

An object is hung using a metal spring.If now a current is passed through the spring,what will happen to this system?

A wire in the shape of an "M" lies in the plane of the paper.It carries a current of 2.0 A,flowing from A to E,as shown in the figure.It is placed in a uniform magnetic field of 0.65 T in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured.What are the magnitude and direction of the force acting on section BC of this wire?

A long straight wire has a constant current flowing to the right.A rectangular metal loop is situated above the wire,and also has a constant current flowing through it,as shown in the figure.Which one of the following statements is true?

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction.Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.(μ₀ = 4π × 10^-7 T ∙ m/A)

A proton,moving north,enters a magnetic field.Because of this field,the proton curves downward.We may conclude that the magnetic field must have a component

A charged particle that is moving in a static uniform magnetic field

A wire in the shape of an "M" lies in the plane of the paper.It carries a current of 2.0 A,flowing from A to E.It is placed in a uniform magnetic field of 0.85 T in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured.What are the magnitude and direction of the net force acting on this wire?

What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?