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
What kind of particle carries the forces?
A.) Quark. B.) Lepton. C.) Electromagnetic. D.) Antiquark. E.) Boson.
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