Resistances connected in parallel all have
A. the same current.
B. the same potential difference.
C. different voltages.
D. the same charge.
B. the same potential difference.
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A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
A. 3.2 ILB B. 5.0 ILB C. 4.2 ILB D. 3.6 ILB E. 1.0 ILB
Density: Concrete is sold by the cubic yard. What is the mass, in kilograms, of 1.00 cubic yard of concrete that is 5.00 times as dense as water? (1.00 m = 1.094 yd, a cubic meter of water has a mass of 1000 kg, and density is mass per unit volume.)
A. 764 kg B. 6550 kg C. 2420 kg D. 8730 kg E. 3820 kg
The Doppler effect refers to changes in a sound wave's
A. amplitude caused by a change in speed of sound. B. amplitude caused by motion of a source or receiver. C. frequency caused by a change in speed of sound. D. frequency caused by motion of a source or receiver.
What produces the lunar phases?
a. The rotation of the Moon b. The revolution of the Moon c. The changing direction of sunlight d. Earth's tilted axis relative to the Moon e. The changing direction of Earth to the Moon