IB 5.1 Electric Fields

What is the definition of electric field strength?

• Work done to move a charge from one place to another

• Force per unit charge experienced by a small, positive charge

• Force between two charges separated by a distance

• The amount of charge per unit time

Which experiment proves that charge carriers in metals are electrons?

• Benjamin Franklin's kite experiment

• Charles Augustin Coulomb's experiment

• The Tolman-Stewart Experiment

What is the  $\epsilon_0$  in this equation?

• Electric force constant

• Electric permittivity of vacuum

• Electric permittivity of medium

What is the electric field strength formula?

• $\frac{kQ}{r^2}$

• $\frac{kQq}{r^2}$

• $\frac{kQq}{r}$

In this formula, what is symbolized by n and v respectively?

• mole number of electrons, drift speed

• number of electrons per unit area, volume

• number of electrons per unit volume, volume

• number of electrons per unit volume, drift speed

In which part of wire drift speed of electrons is less compared to other part?

• A

• B

What is the definition of electric potential difference?

• Electric force per unit charge

• Electric charge per unit time

• Work done per unit charge

Work done to move a charge 10 C between the two points 200 Joules. What is the potential difference between these two points?

• 2000

• 20

• 10

• 200

Why do we need eV as a unit in this topic?

• To relate it with electricity

• To relate the energy with the microscopic world

• To relate the voltage with the microscopic world

What does it mean 'charge is quantised' ?

• Charge cannot be created or destroyed.

• The amount of charge on a body is always the same.

• The amount of charge is always integral multiple of a basic unit.