Charge of uniform density (0.30 nC/m2) is distributed over the xy plane, and charge of uniform density (–0.40 nC/m2) is distributed over the yz plane. What is the magnitude of the resulting electric field at any point not in either of the two charged planes?

a. 40 N/C
b. 34 N/C
c. 28 N/C
d. 46 N/C
e. 6.0 N/C


Answer: c. 28 N/C

Physics & Space Science

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Parallel Wires: Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive. (?0 = 4? × 10-7 T ? m/A)

A. 2.7 × 10-5 N repulsive B. 7.2 × 10-5 N repulsive C. 3.4 × 10-5 N attractive D. 2.7 × 10-5 N attractive E. 7.2 × 10-5 N attractive

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If the stable nuclei are plotted with neutron number vs. proton number, the curve formed by the stable nuclei does not follow the line N = Z. This is predicted by examining how the binding energy is influenced by:

a. the volume of the nucleus. c. the proton-neutron mass difference. b. the size of the nuclear surface. d. the Coulomb repulsion.

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A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other

What type of interference does the person perceive? A) constructive B) destructive C) both constructive and destructive D) neither constructive nor destructive

Physics & Space Science

Water freezes at atmospheric pressure and a temperature of

A) 0 degrees Celsius. B) 32 degrees Fahrenheit. C) about 273 kelvin. D) all of the above E) none of the above

Physics & Space Science