Aparallel-plate capacitor has circular plates and no dielectric between the plates. each plate has a radius equal to 2.8 cm and the plates are separated by 1.1 mm. charge is flowing onto the upper plate (and off the lower plate) at a rate of 4.1 a. find the time rate of change of the electric field between the plates.

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

If a simple machine reduces the strength of a force, what must be increased?

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.