Title: description
Course: Physics copy 1

Q: Using this applet, investigate the effect of increasing the charge on electric field intensity E.

What relationship best describes the relationship between the quantity of charge and electric field intensity?
- $$E \propto q$$
- $$E \propto q^2$$
- $$E \propto \frac{1}{q}$$
- $$E \propto \frac{1}{q^2}$$
A: $$E \propto q$$

Q: Using this applet investigate the relationship between distance from a charge and electric field intensity E.

Which proportionality provides the best description of the relationship between the distance (r) and electric field intensity?
- $$E \propto r$$
- $$E \propto r^2$$
- $$E \propto \frac{1}{r}$$
- $$E \propto \frac{1}{r^2}$$
A: $$E \propto \frac{1}{r^2}$$

Q: Which of the following is the best single expression relating field intensity, charge and distance?
- $$E \propto \frac{q}{r^2}$$
- $$E \propto \frac{q}{r}$$
- $$E \propto \frac{r}{q}$$
- $$E \propto \frac{r^2}{q^2}$$
A: $$E \propto \frac{q}{r^2}$$

Combine your proportionality with Coulomb's constant to create an equation.

The constant in charge force relationships is Coulomb's constant k.

k = 9E+9 Nm^2C^-2

1 uC = 1E-6 Coulombs

Beware, all of the charges below are in micro Coulombs.

The following questions are best solved using proportionalities.

This is an extra description question if needed.

Link to Coulomb's Law.