Charge in an Electric Field: 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
Answer: D
You might also like to view...
Radiative heat transfer requires a fluid to mediate the energy transfer
Indicate whether the statement is true or false
The Sun is at the vernal equinox within one or two days of which of the following dates?
a. March 21 b. September 22 c. December 22 d. June 21
Air 1000°C flows at an inlet velocity of 2 m/s between two parallel flat plates spaced 1 cm apart. Estimate the distance from the entrance to the point where the boundary layers meet.
GIVEN
Air flows between two parallel flat plates
Air velocity (U?) = 2 m/s
Plate spacing (S) = 1 cm = 0.01 m
FIND
The distance from the entrance (xc) where the boundary layers meet
ASSUMPTIONS
Steady flow
Air is dry and at a temperature of 1000°C
SKETCH
A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet. b. The second loop is affected by the thermal exchange from the heating of the first loop. c. It is a gravitational effect on the electrons. d. It is done via an electromagnetic wave.