Work in moving a charge in a field
Answers are for parents and teachers.
1
q = 5 nC, E = 2000 V/m, d = 0.1 m (along the field). What is the work (μJ)?
1
2
A charge of 20 nC moves through a potential difference of 150 V. What is the work (μJ)? (nC·V = nJ)
3
3
An electron is accelerated through 500 V. What is its energy (eV)?
500
4
A proton and an electron are accelerated through the same voltage. Which has the greater speed and why?
The electron’s: the energy is equal (qU) but its mass is much smaller, υ = √(2qU/m).
5
How much work does the field do when a charge moves along an equipotential surface?
Zero, because U = 0.