Torque: A flat circular loop carrying a current of 2.0 A is in a magnetic field of 3.5 T. The loop has an area of 0.12 m2 and its plane is oriented at a 37° angle to the field. What is the magnitude of the magnetic torque on the loop?
A. 0.10 N ? m
B. 0.51 N ? m
C. 0.67 N ? m
D. 46 N ? m
Answer: C
You might also like to view...
Assume a diatomic molecule can be considered to be two point masses separated by a distance r. The center of mass of the system is located a distance x from m1, equal to
a. m1r/(m1 + m2) b. m2r/(m1 + m2) c. (m1 + m2) r/m1 d. (m1 + m2) r/m2 e. r(m2/m1)
A 30-mF capacitor is charged to 40 V and then connected across an initially uncharged 20-mF capacitor. What is the final potential difference across the 30-mF capacitor?
a. 15 V b. 24 V c. 18 V d. 21 V e. 40 V
Two moles of an ideal gas are placed in a container of adjustable volume. When measurements are made
a. the pressure is inversely proportional to the volume at constant temperature. b. the temperature is directly proportional to the volume at constant pressure. c. the temperature is directly proportional to the pressure at constant volume. d. all the statements above are found to be correct. e. only statements (a) and (b) are found to be correct.
Petra pushes a crate across a rough floor. A frictional force of 28.0 N acts to oppose the motion of the crate, and Petra pushes with a horizontal force of 36.4 N. If the net work Petra does is 94.5 J, through what distance did she push the crate?
a. 11.3 m b. 3.38 m c. 2.60 m d. 2 650 m e. 3 440 m