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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science