Iron absorption lines that occur in the solar spectrum indicate that iron exists in the solar
A) atmosphere.
B) surface.
C) interior.
D) none of the above
Answer: A
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About how big is an atom?
a. too small to measure b. about a millionth of a meter across c. about a billionth of a meter across d. about a trillionth of a meter across e. none of the above
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
An open circuit consists of a 12-?F parallel plate capacitor charged to 200 V and a 10-? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
a. 1.2 ?A. b. 2.4 × 10^?4 A. c. 2.4 mA. d. 10 A. e. 20 A.
Give an example in which thermal energy might be converted to gravitational energy
What will be an ideal response?