A particle with a charge of +4.0 C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A) 4.1 104 N/C
B) 8.2 104 N/C
C) 4.4 104 N/C
D) 1.2 104 N/C
E) 5.1 104 N/C
Question 2
A geophysicist measures the magnetic force on a proton that is moving vertically downward at a point 1.996 km/s at the earth's equator. At that location, the earth's magnetic magnetic field is horizontal and has a strength of 0.40 10-4 T.
What are the magnitude and direction of the force she will measure? (e = 1.60 10-19 C)
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