What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?0 = 4? × 10-7 T ? m/
A)
31 µT
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The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.
A damped oscillator is released from rest with an initial displacement of 10.00 cm. At the end of the first complete oscillation the displacement reaches 9.05 cm. When 4 more oscillations are completed, what is the displacement reached?
a. 7.41 cm b. 6.71 cm c. 6.07 cm d. 5.49 cm e. 5.25 cm
The number of protons in a nucleus equals the number of neutrons
a. True b. False Indicate whether the statement is true or false
What is the maximum velocity of a photoelectron emitted from a surface with work function 3.5 eV when illuminated by 289 nm ultraviolet light? (melectron = 9.11 × 10^?31 kg, h = 6.63 × 10^?34 J?s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 3.75E+5 m/s b. 5.31E+5 m/s c. 7.28E+2 m/s d. 8.62E+5 m/s e. 1.60E+6 m/s