SP025 Chapter 2 Capacitors & Dielectric (C1&C2)

What is the SI unit of capacitance?

• CV

• F

• VC

What is the definition of capacitance?

• The ratio of potential       difference between plates to the charge on either plate

• The ratio of charge on  either plate to the potential difference between plates

• The charge on either plate and the potential difference between plates

• The potential difference with charge on either plate

During charging a capacitor through a resistor....

• The current in the circuit increase linearly with time

• The current in the circuit increase exponentially with time

• The current in the circuit decrease linearly with time

• The current in the circuit decrease exponentially with time

When charging a capacitor in RC circuit, the time constant is the time needed for the charge of the capacitor to reach … of its maximum charge.

• 37%

• 50%

• 63%

• 86%

When will the capacitor be fully charged?

• When voltage across capacitor is zero

• When voltage is infinity

• When the voltage across the capacitor is equal to the supply voltage

• When capacitor voltage is equal to half the supply voltage

In a parallel plate capacitor, the capacity increases if

• Area of the plate is decreased

• Dielectric constantly decreases

• Distance between the plates increases

• Area of the plate is increased

When a dielectric slab is put in between a parallel plate capacitor which remains connected to a battery, then charge on the plates relative to earlier charge is:

• More

• Less

• Same

• Zero

What happen to the potential difference when a dielectric is inserted in a parallel plate capacitor?

• increase

• decrease

• remains constant

• becomes zero

What is the best description of a dielectric?

• When it is placed between the plates of capacitor, the capacitance will decrease

• When it is placed between the plates of capacitor, the electric field will increase

• It is a non-conducting material

• All of these choices are true

When capacitors is arrange in series (3 capacitors), the equivalent capacitance C is

• C = C₁ + C₂ + C₃

• 1/C = 1/C₁ + 1/C₂ + 1/C₃

• C = QV₁ + QV₂ + QV₃

• C = CR₁ + CR₂ + CR₃