Exam 22: Magnetism

A long straight wire carrying a 4-A current is placed along the x-axis as shown in the figure.What is the magnitude of the magnetic field at a point P,located at y = 2 cm,due to the current in this wire?

Two long,parallel wires carry currents of different magnitudes.If the amount of current in one of the wires is doubled,what happens to the magnitude of the force that each wire exerts on the other?

When a ferromagnetic material is placed in an external magnetic field,the net magnetic field of its magnetic domains becomes

The magnetic field due to the current in a long,straight wire is 8.0 μT at a distance of 4.0 cm from the center of the wire.What is the current in the wire? (μ₀ = 4π × 10^-7 T ∙ m/A)

A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle.The magnetic force on this particle

A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field.The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ∙ m.What is the area of this loop?

An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long.If this solenoid carries a current of 12 A,what is the magnitude of the magnetic field at the center of the solenoid? (μ₀ = 4π × 10^-7 T ∙ m/A)

Consider an ideal solenoid of length L,N windings,and radius b (L is much longer than b).A current I is flowing through the wire windings.If the length of the solenoid becomes twice as long (to 2L),but all other quantities remained the same,the magnetic field inside the solenoid will

A proton having a speed of 3.0 × 10⁶ m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field.What is the magnitude of the magnetic field? ,

A charged particle of mass 0.0040 kg is subjected to a Magnetic field which acts at a right angle to its motion.If the particle moves in a circle of radius At a speed of What is the magnitude of the charge on the particle?

A doubly charged ion with speed 6.9 × 10⁶ m/s enters a uniform 0.80-T magnetic field,traveling perpendicular to the field.Once in the field,it moves in a circular arc of radius 30 cm.What is the mass of this ion? (e = 1.60 × 10^-19C).

A rigid rectangular loop,measuring 0.30 m by 0.40 m,carries a current of 5.5 A,as shown in the figure.A uniform external magnetic field of magnitude 2.9 T in the -x direction is present.Segment CD is in the xz-plane and forms a 35° angle with the z-axis,as shown.What is the magnitude of the torque that the magnetic field exerts on the loop?

Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction.The current in one wire is 20 A,and the current in the other wire is 5 A.If the magnetic force on the 20-A wire has magnitude F,what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present.

A positive charge is moving to the right and experiences an upward magnetic force,as shown in the figure.In which direction must the magnetic field have a component?

A proton moving eastward with a velocity of 5.0 km/s enters a magnetic field of 0.20 T pointing northward.What are the magnitude and direction of the force that the magnetic field exerts on the proton? (e = 1.60 × 10^-19C)

Alpha particles,each having a charge of +2e and a mass of 6.64 × 10^-27 kg,are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m.The field is perpendicular to the velocity of the particles.How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10^-19C)

What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.

We observe that a moving charged particle experiences no magnetic force.From this we can definitely conclude that

A flat circular coil has 200 identical loops of very thin wire.Each loop has an area of 0.12 m² and carries 0.50 A of current.This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop.What is the magnitude of the magnetic torque on the coil?

A single current-carrying circular loop of radius R is placed next to a long,straight wire,as shown in the figure.The current I in the wire flows to the right.In which direction must current flow in the loop to produce a net magnetic field of zero at its center?