Practice Electric Field in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A region around a charged object where other charges experience a force. Measured in newtons per coulomb (N/C) or volts per meter (V/m).
Every charge creates an invisible 'force zone' around it. Another charge entering this zone feels a push or pull without touching anything.
Example 1
mediumWhat is the electric field 0.5 \text{ m} from a point charge of 4 \times 10^{-6} \text{ C}? Use k = 9 \times 10^9 \text{ N m}^2/\text{C}^2.
Example 2
mediumA charge of 2 \times 10^{-9} \text{ C} is placed in an electric field of 5000 \text{ N/C}. What force does it experience?
Example 3
hardTwo parallel plates are separated by 0.02 \text{ m} with a potential difference of 100 \text{ V}. What is the electric field between the plates?
Example 4
hardTwo point charges are placed on the x-axis: q_1 = +3 \times 10^{-6} \text{ C} at x = 0 and q_2 = +3 \times 10^{-6} \text{ C} at x = 0.4 \text{ m}. Find the electric field at the midpoint (x = 0.2 \text{ m}). Use k = 9 \times 10^9.