Electrostatics

Drift velocity is the average velocity that free electrons attain in a conductor due to an electric field, which is typically very slow, around 10^-3 m/s. In contrast, 10^3 m/s represents the much faster random thermal velocity of these electrons, while 10^8 m/s is close to the speed of light.

Electric field intensity is defined as the force per unit charge experienced by a test charge, leading directly to the unit Newton per Coulomb (N/C). Option C is incorrect because it inverts the ratio, representing charge per unit force instead of force per unit charge.

Electric field intensity is defined as the force per unit charge experienced by a test charge, leading directly to the unit Newton per Coulomb (N/C). A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Option C is incorrect because it inverts the ratio, representing charge per unit force instead of force per unit charge.
• !Option A is incorrect because simply adding the capacitances applies to parallel connections, not series configurations.

Answer each from memory — you'll see instantly whether you're right and why.

Run a focused 10-question mini-mock on Electrostatics and see it stick.