The _____ occurs when some of the energy in the convective motion of gas is converted into magnetic field energy
a. meridional flow
b. Maunder minimum
c. dynamo effect
d. reconnection event
e. Zeeman effect
c
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What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz?
A) less than 1 km B) 1 km C) more than 1 km
When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the terminal voltage of the battery falls 0.30 V. What is the internal resistance of this battery?
A) 3.60 ? B) 1.56 ? C) 0.98 ? D) 0.30 ? E) 0.51 ?
You throw a ball straight up, it peaks out and then comes back down to you. During this motion, the velocity and acceleration always point in the same direction
Indicate whether the statement is true or false
A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
a. 39 km/s2 b. 43 km/s2 c. 48 km/s2 d. 52 km/s2 e. 25 km/s2