A uniform magnetic field is directed perpendicular to the xy -plane. A 4.0-m len

Question

A uniform magnetic field is directed perpendicular to the xy-plane. A 4.0-m length of conducting wire is to be formed into a two-dimensional shape and then placed in the xy-plane. Which shape would experience the greatest magnetic flux through it?

A. a square

B. a circle

C.a rectangle, its length twice its width

D.a rectangle, its length four times the width

A coil of conducting wire is connected to a device that measures current. A student has a bar magnet and wants to induce a current in the coil. Which action is most likely to induce the strongest current?

A. Place the bar magnet in the center of the coil.
B.Press the side of the bar magnet against as much of the coil as possible.
C.Move the bar magnet rapidly up and down near the coil.
D.Hold one pole of the bar magnet as close as possible to the coil without touching it.

One of the earliest applications of the mass spectrometer involved measuring the atomic masses of neon. Which discovery resulted from this analysis?

A.Particles within atoms can carry electric charges.
B.Many elements have several isotopes.
C.Atoms consists of three different kinds of particles.
D.Ions form when atoms gain or lose electrons

Explanation / Answer

1.B. a circle

2.C.Move the bar magnet rapidly up and down near the coil.

3.B.Many elements have several isotopes.

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