An electroscope is charged positively as indicated by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves become

A) closer together.
B) farther apart.
C) motionless.


Answer: A

Physics & Space Science

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Force on a Wire: A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.60 N, what is the current in the wire?

A. 2.0 A B. 1.0 A C. 3.0 A D. 4.0 A E. 5.0 A

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Consider an equilateral triangle of side 20. cm. A charge of +2.0 ?C is placed at one vertex and charges of -4.0 ?C are placed at the other two vertices. Determine the magnitude and direction of the electric field at the center of the triangle

What will be an ideal response?

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A 15.0-kg crate, initially at rest, slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)

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Why couldn't you use an electric motor to turn an electrical generator that in turn provides the electrical energy for the motor?

A. Yes, you can do this B. No energy converter is 100% efficient C. Motors require AC and generators produce DC

Physics & Space Science