Quiz 1-3 SP025 (EASY)

According to the Coulomb's law, the force of attraction or repulsion between two point charges is directly proportional to the

• sum of the magnitude of charges

• square of the distance between them

• product of the magnitude of charges

• cube of the distance

If F is the force acting on the test charge qₒ, the electric field intensity E would be given by

• E = F - q₀

• E = F/q₀

• E = F + q₀

• E = q₀/F

Electric potential is a

• scalar quantity

• vector quantity

• dimensionless quantity

• none of the following

Equipotential surface is

• a surface on which all points are at the same potential

• perpendicularly to the electric field at any point

• a line on which all points are at the same potential

The charge on capacitor plates is directly proportional to

• current

• electric field intensity

• potential difference

• resistance

A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

• when capacitor is fully charged

• when capacitor is 37% charged

• when capacitor is almost 25% charged

• None of the following

The effect of a dielectric is to ............... the capacitance.

• decrease

• increase

• constant

• not related

Which of the following methods can be used to increase the capacitance of a parallel plate capacitor?

• The distance between the plates is increased

• A greater plate area is used

• The potential difference between the plates is increased

• Materials with smaller dielectric constant is used

The amount of charge flowing through a cross-sectional area of a wire per unit of time is called

• Power

• Resistance

• Work

• Current

A wire of length, L and cross-sectional area, A has a resistivity, ρ. Which of the following formulas can be used to calculate the resistance of the wire?

• R = 𝜌𝐿 / 𝐴

• R = 𝜌𝐴 / 𝐿

• R = 𝐿 / 𝜌𝐴

• R = 𝐴 / 𝜌 𝐿