Exam 19: Magnetism

A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis.To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis.The second magnet is free to move.Once placed in position at rest,which best describes the initial motion of the second magnet?

The magnetic field of the Earth is believed responsible for which of the following?

A wire is lying horizontally in the north-south direction and the horizontal magnetic field is toward the east.Some positive charges in the wire move north and an equal number of negative charges move south.The direction of the force on the wire will be:

A deuteron,with the same charge but twice the mass of a proton,moves with a speed of 6.00 × 10⁵ m/s perpendicular to a uniform magnetic field of 0.0525 T.Which of the paths described below would it follow? (q_p = 1.60 × 10−¹⁹ C and m_d = 3.34 × 10−²⁷ kg)

Two long parallel wires 45.6 cm apart are carrying currents of 13.0 A and 23.0 A in the same direction.What is the magnitude of the magnetic field halfway between the wires?

The direction of the force on a current carrying wire located in an external magnetic field is which of the following?

A proton moves through a magnetic field of magnitude 1.40 T with speed 5.00 *10⁶ m/s.What is the magnitude of the maximum acceleration of the proton? The mass of a proton is 1.67 *10^-27 kg,and its charge is 1.6 *10^-19 C.

Four long wires are perpendicular to the x-y plane.Each wire carries the same magnitude current.Wire 1 goes through point (a,a,0)on the x-y plane,wire 2 goes through the point (-a,a,0),wire 3 goes through the point (-a,-a,0),and wire 4 goes through the point (a,-a,0).Wires 1 and 2 carry their currents in the positive z direction and wires 3 and 4 carry their currents in the -z direction.What is the direction of the resulting magnetic field at the origin?

A proton moving with a speed of 3.20 × 10⁵ m/s perpendicular to a uniform magnetic field of 0.0786 T will follow which of the paths described below? (q_p = 1.60 × 10−¹⁹ C and m_p = 1.67 × 10−²⁷ kg)

Magnetism had been a known phenomenon for some time before its relation to electric currents was found.That a current in a wire produces a magnetic field was discovered by:

If a charged particle is moving in a uniform magnetic field,its path can be

A current in a solenoid coil creates a magnetic field inside that coil.The field strength is directly proportional to:

A current in a long,straight wire produces a magnetic field.The magnetic field lines:

An electron which moves with a speed of 4.5 × 10⁴ m/s perpendicular to a uniform magnetic field of 0.57 T experiences a force of what magnitude? (e = 1.6 × 10−¹⁹ C)

A proton is released such that its initial velocity is from right to left across this page.The proton's path,however,is deflected in a direction toward the bottom edge of the page due to the presence of a uniform magnetic field.What is the direction of this field?

The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?

There is a magnetic force on a particle.It is possible that the particle is:

Consider two long,straight parallel wires,each carrying a current I.If the currents are flowing in opposite directions:

Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward,the wires crossing at their midpoints separated only by their insulation.Which of the following statements are true?

The current in a long wire creates a magnetic field in the region around the wire.How is the strength of the field at distance r from the wire center related to the magnitude of the field?