The power rating of a resistor is 0.800 W. If the value of the resistor is 400 ?, what is the maximum voltage?
A) 110 V
B) 17.9 V
C) 170 V
D) 1.80 V
B
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If R = 4.0 k?, C = 3.0 mF, ? = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb?Va?
A. +3.0 V B. ?19 V C. ?3.0 V D. +27 V E. +21 V
A cat and a mouse run along a road with the same kinetic energy. The faster runner is the
A) cat. B) mouse. C) both run at the same speed D) not enough information
A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 ?N b. 16 ?N c. 18 ?N d. 12 ?N e. 0 ?N
Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.