Electricity and Magnetism Answers

Design and draw a zener voltage regulator to provude 12 volt output if load resistance varies between 100 ohm and 200 ohm .Assume that the input unregulated dc voltage is 18 volt and minimum zener operating current is 10mA.Calculate the wattage of the zener diode ,value and wattage of Rs.

How much work is done to transfer 2.6 C of charge through a potential difference of 120 V?

How much work is required to move a positive charge of 3.6 µC between two points that have a potential difference of 69 V?

A spark will jump between two people if the electric field exceeds 4.0 x 106 V/m. You shuffle across a rug and a spark jumps when you put your finger 0.48 cm from another person’s arm. Calculate the potential difference between your body and the other person’s arm.

A potential difference of 0.90 V exists from one side to the other side of a cell membrane that is 4.7 nm thick. What is the electric field across the membrane?

A cloud has a potential difference relative to a tree of 6.8 x 102 MV. During a lightning storm, a charge of 1.60 x 102 C travels through this potential difference. How much work is done on this charge?

It takes 7.3 mJ to move a charge of 4.7 μC from Point A to Point C in an electric field. What is the potential difference between the two points?

What is the potential difference required to stop a proton traveling at an initial speed of 2.33 x 107 m/s? ( mass of a proton is 1.67 x 10-27 kg)

What is the potential difference required to stop an electron traveling at an initial speed of 2.29 x 107 m/s? (mass of an electron is 9.1 X 10-31 kg)