What is the direction of the electric field 0.1 mm above the center of the top surface of the plate?

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Which accurately compares concave and convex lenses?

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?