3749

Physics Electrostatics Level: University

Potentials
An electron starting from rest acquires 4.90 keV of kinetic energy in moving from point A to point B. How much kinetic energy would a proton acquire starting from rest at B and moving to point A?

3710

Physics Electrostatics Level: University

Capacitor
A parallel plate capacitor is constructed with circular plates of radius 0.750 cm and plate separation 0.0500 mm. If the capacitor is connected across a 37.2V source find.
(a) The capacitance.
(b) The surface charge in each plate.
(c) The energy stored in the capacitor.
(d) The electric field between plates.
(e) If a slab of plastic with dielectric constant K = 3.6 is inserted between the plates of the capacitor What will the capacitance be?

3558

Physics Electrostatics Level: University

The magnitude of the charge on the plates of an isolated parallel plate capacitor is doubled. Which one of the following statements is true concerning the capacitance of this parallel-plate system?
a. The capacitance is decreased to one half of its original value.
b. The capacitance is increased to twice it original value.
c. The capacitance remain unchanged
d. The capacitance depends the electric field between the plates.
e. The capacitance depends on the potential difference across the plates

3557

Physics Electrostatics Level: University

Which one of the following statements concerning electrostatic situations is false?
a. E is zero everywhere inside a conductor
b. Equipotential surfaces are always perpendicular to E
c.It takes zero work to move a charge along an equipotential surface
d. If V is constant throughout a region of space then E must be zero in that region
e. No force component acts along the path of a charge as it moved along the equipotential surface.

3249

Physics Electrostatics Level: High School

capacitance

An air dielectric parallel-plate capacitor and the charging source is not disconnected. A Mica dielectrics is slipped between the plates. What happens?

1) The stored energy increases.

2) The stored energy decreases.

3) The capacitance is decreased and the voltage across the plates is increased.

4) The capacitance is increased and the voltage across the plates is increased.

3248

Physics Electrostatics Level: High School

capacitance

An air dielectric parallel-plate capacitor and the charging source is disconnected. A Mica dielectric is slipped between the plates. Which of the following happened?

1) The stored energy increases.

2) The stored energy decreases.

3) The capacitance is designed and the voltage across the plates is increased.

4) The capacitance is increased and the voltage across the plates is increased.

3219

Physics Electrostatics Level: High School

An electron is shot into an electric field, and enters the field at right angles to it. The field exerts a force on the electron. The direction of this force vector is:-

1)The same as the field strength vector.

2)Opposite to the field strength vector.

3)Either (1) or (2) depending on the velocity of the electron as it enters the electric field.

4)The resultant of two vectors, one parallel to and one perpendicular to the field strength vector.

3089

Physics Electrostatics Level: High School

Coulomb’s Law

A point charge of -0.75 micro C is fixed to one corner of a square .An identical charge is fixed to the originally opposite corner . A point charge q is fixed to each of the remaining corners . The net force on either of the charges q is zero . Find the magnitude and algebraic sign of q . micro C .

2773

Physics Electrostatics Level: High School

Electric Field

Which one of the following statements is true concerning the spacing of the electric field lines in the vicinity of two point charge of equal magnitude and opposite sign ?

a) It indicates the direction of the electric field

b) It does not depend on the magnitude of the charges.

c) It is large when the magnitude of the charges is large.

d) It indicate the relative magnitude of the electric field

e) It is small when the magnitude of the charges is small .

2769

Physics Electrostatics Level: High School

Electrostatic Induction

A charged conductor is bought near an uncharged insulator . Which one of the following statements is true ?

a) Both objects will repel each other .

b) Both objects will attract each other .

c) Neither object exerts an electrical force on the other

d) The object will repel each other only if the conductor has a negative charge .

e) The object will attract each other only if the conductor has a positive charge