Which of the following components of an electrical circuit is a source of voltage?

a. a switch
b. a battery
c. a resistor
d. a light bulb

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

What happens when a rubber rod is rubbed with a piece of fur?

Does the asteroid belt revolve around the sun?