Surrounding a magnet is a magnetic field. Surrounding an electron is an electric field. Surrounding Earth is
A) an alteration in space in which mass experiences a force.
B) a gravitational field.
C) both of these
D) neither of these
Answer: C
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At the Earth’s orbital distance, the intensity of the solar radiation is approximately 1400 W/m2. What is the value for the intensity at Mercury’s orbital distance, which is 38.7% the distance to the sun that the Earth is.
A. 
B. 
C. 
D. 
An asteroid, of mass
kg is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0m/s. What is its radius?
A. 6.3 km B. 2.1 km C. 1.0 km D. 0.5 km
A coil with a self-inductance of 6.0 H is connected to a dc source through a switch. As soon as the switch is closed at t = 0 s, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at t = 0 s?
A) 6.0 V B) 3.0 V C) 12 V D) 0.33 V E) 0 V
What kind of particle carries the forces?
A.) Quark. B.) Lepton. C.) Electromagnetic. D.) Antiquark. E.) Boson.