Physics
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A region of space has an electric field directed vertically upward. A point charge q = +12.0 × 10-9 C is held at rest in the electric field. When freed, the charge travels upward. The kinetic energy of the charge is found to be +3.6 µJ when it has traveled a distance of 3.40 cm. Calculate the work done by the electric force.
A stationary particle of charge +3.25 μC is located at the origin of an XY plane. The position of the second particle of charge -4.40 μC changes from (x,y) = (-8.50 cm, 0 cm) to (x,y) = (10.0 cm, 12.5 cm). Calculate the work done by the electric force on the second particle.
A 12 V battery does 60 J of work pumping charge across a bulb's filament. Calculate the charge that flows from the negative terminal to the battery's positive terminal.
In a photoelectric device, electromagnetic radiation moves electrons from the cathode to the anode, doing 5.3 × 10 -19 J of work per electron. Calculate the emf (give magnitude only) created in the device.
A 5.0 V charging adapter sends a current of 2.0 A to a device. Calculate the work the charging adapter does to pump a charge of 0.8 C.
A power supply does 32 J of work to push 4.8 × 10 19 electrons from a positive terminal to a negative terminal on a load in a duration of 3.0 s. Calculate the emf (give magnitude only) of the power supply.