Exam 19: Magnetism Magnets

A horizontal wire of length 4.3 m carries a current of 6.2 A and is oriented so that the current direction is 75° S of W.The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10−⁴ T.What is the size of the force on the wire?

The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?

When a magnetic field causes a charged particle to move in a circular path,the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper.If the magnetic field B is toward the right,and if each side of the loop has length L,then the net magnetic force acting on the loop is:

Two long parallel wires 10 cm apart carry currents of 4.2 A and 8.7 A in the same direction.Is there any point between the two wires where the magnetic field is zero?

Which of the following is not a hard magnetic material?

The path of a charged particle moving parallel to a uniform magnetic field will be a:

A square coil and a triangular coil each have sides of length L.The triangular coil has twice as many turns as the square coil.If a the same current is sent through each coil,when the coils are placed in the same uniform magnetic field making an angle of 30^° with the planes of the coils,which coil experiences the greater torque?

Assume that a uniform magnetic field is directed into this page.If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page,which of the following describes the direction of the resultant force acting on the electron?

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

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

Solenoid №1 has a length L,cross-sectional area A,and N turns.Solenoid №2 has a length 2L,cross-sectional area 2A,and 2N turns.Which solenoid has the greater magnetic field at its center when equal currents are going through them?

A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field.A deuteron has the same charge as the proton but has twice its mass.The ratio of the magnetic force on the proton to that on the deuteron is:

The right-hand rule allows one to find a property of the interaction of a magnetic field with a charged particle.The right-hand rule applied to moving charges:

Two singly ionized isotopes,X and Y,of the same element move with the same speed perpendicular to a uniform magnetic field.Isotope X follows a path of radius 3.29 cm while isotope Y moves along a path 3.43 cm in radius.What is the ratio of the two isotope masses,

Different units can be used to measure the same physical quantity,differing only by some multiplicative factor.The cgs unit for magnetic field,the gauss,is equal to ________ tesla.

An incredible amount of electrical energy passes down the funnel of a large tornado every second.Measurements at a distance of 11.95 km from a large tornado showed an almost constant magnetic field of 2.69 × 10−⁸ T associated with the tornado.What was the average current going down the funnel? (µ₀ = 4π × 10−⁷ T⋅m/A)

A proton,mass 1.67 × 10−²⁷ kg and charge +1.6 × 10−¹⁹ C,moves in a circular orbit perpendicular to a uniform magnetic field of 0.66 T.Find the time for the proton to make one complete circular orbit.

If a proton is released at the equator and falls toward the Earth under the influence of gravity,the magnetic force on the proton will be toward the:

Superconductors can carry very large currents with no resistance.If a superconducting wire is formed into a solenoid of length 74.6 cm with 660 turns,what is the magnetic field inside the solenoid when the current is 6.5 kA? (µ₀ = 4π × 10−⁷ T⋅m/A)