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Exam 28: Magnetic Fields

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Question 21

Multiple Choice

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The diagrams show five possible orientations of a magnetic dipole in a uniform magnetic field For which of these does the magnetic torque on the dipole have the greatest magnitude?

A) I
B) II
C) III
D) IV
E) V

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Question 22

Multiple Choice

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A magnetic field exerts a force on a charged particle:

A) always
B) never
C) if the particle is moving across the field lines
D) if the particle is moving along the field lines
E) if the particle is at rest

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Question 23

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An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:

An electron moves in the negative x direction, through a uniform magnetic field in the negative y direction. The magnetic force on the electron is:

A current is clockwise around the outside edge of this page and a uniform magnetic field is directed parallel to the page, from left to right. If the magnetic force is the only force acting on the page, the page will turn so the right edge:

The figure shows the motion of electrons in a wire which is near the N pole of a magnet. The wire will be pushed:

The units of magnetic dipole moment are:

Electrons (mass m, charge -e) are accelerated from rest through a potential difference V and are then deflected by a magnetic field that is perpendicular to their velocity. The radius of the resulting electron trajectory is:

A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.7 T uniform magnetic field is parallel to the hypotenuse. The resultant magnetic force on the two sides has a magnitude of:

A circular loop of wire with a radius of 20 cm lies in the xy plane and carries a current of 2 A, counterclockwise when viewed from a point on the positive z axis. Its magnetic dipole moment is:

An electron is travelling in the positive x direction. A uniform electric field is in the negative y direction. If a uniform magnetic field with the appropriate magnitude and direction also exists in the region, the total force on the electron will be zero. The appropriate direction for the magetic field is:

An electron and a proton are both initially moving with the same speed and in the same direction at 90˚ to the same uniform magnetic field. They experience magnetic forces, which are initially:

A hydrogen atom that has lost its electron is moving east in a region where the magnetic field is directed from south to north. It will be deflected:

A loop of current-carrying wire has a magnetic dipole moment of 5 * 10^-4 A . m². The moment initially is aligned with a 0.5-T magnetic filed.To rotate the loop so its dipole momentt is perpendicular to the field and hold it in that orentation, you must do work of:

A charged particle is projected into a region of uniform, parallel, fields. The force on the particle is:

You are facing a loop of wire which carries a clockwise current of 3.0 A and which surrounds an area of 5.8 10⁻²m². The magnetic dipole moment of the loop is:

A uniform magnetic field is directed into the page. A charged particle, moving in the plane of the page, follows a clockwise spiral of decreasing radius as shown. A reasonable explanation is:

An electron (charge = -1.6 * 10^-19C) is moving at 3 * 10⁵ m/s in the positive x direction. A magnetic field of 0.8 T is in the positive z direction. The magnetic force on the electron is:

At any point the magnetic field lines are in the direction of:

An electron enters a region of uniform perpendicular fields. It is observed that the velocity of the electron is unaffected. A possible explanation is: