Introduction to Electric Fields A2

What is an electric field?

• Force per unit positive charge
• Force per unit negative charge
• Work done per unit charge
• Voltage per unit distance

Which equation expresses the force on a charge q in an electric field E?

• F = qE
• F = E/q
• F = q/E
• F = E - q

How are electric fields typically represented visually?

• Field lines
• Equipotential surfaces
• Force vectors
• Voltage contours

What formula is used to calculate the field strength of a uniform electric field between parallel plates?

• E = ∆V/∆d
• E = ∆d/∆V
• E = q/∆V
• E = F/q

In a uniform electric field, what happens to a positive charge released from rest?

• It accelerates in the direction of the field
• It accelerates opposite to the field
• It remains stationary
• It moves in a circular path

For any point outside a spherical conductor, how can the charge on the sphere be considered?

• As a point charge at its centre
• As distributed uniformly over its surface
• As concentrated at one pole
• As negligible compared to nearby charges

Which law is used to calculate the electric force between two point charges?

• Coulomb's law
• Ohm's law
• Faraday's law
• Ampère's law

What is the correct form of Coulomb's law for two point charges Q₁ and Q₂ separated by a distance r in free space?

• F = (Q₁Q₂)/(4πε₀r²)
• F = (Q₁Q₂)/(ε₀r)
• F = (Q₁Q₂)/(4πε₀r)
• F = (Q₁Q₂)4πε₀r²

What is the formula for the electric field strength due to a point charge Q at a distance r?

• E = Q/(4πε₀r²)
• E = Q/(4πε₀r)
• E = 4πε₀Q/r²
• E = Q²/(4πε₀r²)

How is electric potential at a point defined?

• The work done per unit positive charge in bringing a test charge from infinity
• The energy stored per unit charge
• The force experienced per unit charge
• The voltage difference between two points