Magnification of concave lens is: 1. always less than 1
2. always greater than 1
3. always equal to 1
4. sometimes less and sometimes greater than 1

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e