A square coil, enclosing an area with sides 3.0 cm long, is wrapped with 2500 turns of wire. A uniform magnetic field perpendicular to its plane is turned on and increases to 0.12 T during an interval of 1.0 s. What average voltage is induced in the coil?
a. 2.5 V
c. 1.2 V
b. 0.27 V
d. 0.12 V
B
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Refer to the sketch above of an H-R diagram for a star cluster. Consider the star to which the arrow points. How is it currently generating energy?
A) by gravitational contraction B) by hydrogen shell burning around an inert helium core C) by core hydrogen fusion D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
Clovis wants to lose weight. Clotilde tells him that he will be thin enough for her if he travels past her at 0.600 c. If the distance she sees from the front of his stomach to his back is then 24.0 cm, what distance in cm does she see when he is standing still?
a. 15.4 b. 19.2 c. 24.0 d. 30.0 e. 37.5
The frequency of a microwave signal is 9.76 GHz. What is its wavelength? (c = 3.00 × 108 m/s)
A) 3.07 cm B) 2.07 cm C) 1.07 cm D) 5.07 cm E) 4.07 cm
Energy in Inductors: A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in its magnetic field?
A. 2.0 mJ B. 10 mJ C. 20 mJ D. none of the given answers