Topic 5: Electricity and Magnetism

Question 1

What’s the defining equation for the electric field?

Answer 1

E=F/q

Question 2

What’s the determining equation for the electric field?

Answer 2

F=(k*Q1)/r^2

Question 3

What’s the defining equation to calculate current?

Answer 3

I=△q/△t

Question 4

What’s the determining equation for current?

Answer 4

I=nAVq

Question 5

How many joules does one eV equal to?

Answer 5

1eV=1.6*10^-19J

Question 6

What does emf refer to?

Answer 6

The power supplied by the cell per unit current from the cell. (Very rigorous)

Question 7

When should I apply Ohm’s law when a graph is given?

Answer 7

Check whether the graph is a straight line. If so, then Ohm’s law is applicable.

Question 8

What does right-hand grip rule do?

Answer 8

Determine the direction of the magnetic field

Question 9

What does left-hand rule do?

Answer 9

Decide the direction of the magnetic force.

Question 10

The definition of ampere?

Answer 10

The ampere is defined through the magnetic force between two parallel wires.