Question 1

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−17 J.What is the magnitude of the electric field that will stop these electrons in a distance of 0.3 m? (e = 1.6 × 10−19 C)

Accepted Answer

A) 1.9E+3 N/C 
B) 7.5E+3 N/C 
C) 8.3E+2 N/C 
D) 1.3E+3 N/C 
E) ​6.3E+3 N/C

Question 2

A charge Q accumulates on the hollow metallic dome,of radius R,of a Van de Graaff generator.A probe measures the electric field strength at various points outside the sphere surface.By what factor will the electric field value at the 2R distance be changed if the charge value were increased to (5/3)Q?

Accepted Answer

A) (5/3)2 
B) 5/3 
C) 3/5 
D) (3/5)2 
E) ​5

Question 3

Electric field is dimensionally equivalent to which of the following?

Accepted Answer

A) N⋅m/C 
B) N/C 
C) N⋅m2/C2 
D) N/C2

Question 4

A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell.The charge q does not touch the shell.What is the charge on the outer surface of the shell?

Accepted Answer

A) q 
B) −q 
C) 2q 
D) 0

Question 5

Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm.What is the electric field midway between the two charges? (ke = 8.99 × 109 N·m2/C2)​

Accepted Answer

A) 7.1E+8 N/C 
B) 3.5E+8 N/C 
C) 1.8E+8 N/C 
D) zero 
E) ​2.0E+8 N/C

Question 6

At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?

Accepted Answer

A) where surface curves inward 
B) where surface is flat 
C) where curvature is least 
D) where curvature is greatest

Question 7

In Millikan's oil drop experiment,if the electric field between the plates was of just the right magnitude,it would exactly balance the weight of the drop.Suppose a tiny spherical oil droplet of radius 1.3 × 10−4 cm carries a charge equivalent to one electron.What electric field is required to balance the weight? (The density of oil is 0.85 g/cm3,e = 1.6 × 10−19 C. )​

Accepted Answer

A) 3.8E+6 N/C 
B) 6.0E+4 N/C 
C) 9.4E+2 N/C 
D) 4.8E+5 N/C 
E) 1.3E+7 N/C

Question 8

Object A has a charge q on it,object B has a charge q on it,and object C has a charge 3q on it.These charges are arranged,one each,at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?​

Accepted Answer

A) A 
B) B 
C) C 
D) All have equal magnitude forces on them. 
E) ​A and B

Question 9

An uncharged conductor is supported by an insulating stand.I pass a positively charged rod near the left end of the conductor,but do not touch it.The right end of the conductor will be

Accepted Answer

A) negative. 
B) positive. 
C) neutral. 
D) attracted.

Question 10

If a conductor is in electrostatic equilibrium near an electrical charge:

Accepted Answer

A) the total charge on the conductor must be zero. 
B) the electric field inside the conductor must be zero. 
C) any charges on the conductor must be uniformly distributed. 
D) the sum of all forces between the conductor and the charge must be zero.

Exam 15: Electric Forces and Fields

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−¹⁷ J.What is the magnitude of the electric field that will stop these electrons in a distance of 0.3 m? (e = 1.6 × 10−¹⁹ C)

Electric field is dimensionally equivalent to which of the following?

A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell.The charge q does not touch the shell.What is the charge on the outer surface of the shell?

Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm.What is the electric field midway between the two charges? (k_e = 8.99 × 10⁹ N·m²/C²)

At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?

Object A has a charge q on it,object B has a charge q on it,and object C has a charge 3q on it.These charges are arranged,one each,at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?

An uncharged conductor is supported by an insulating stand.I pass a positively charged rod near the left end of the conductor,but do not touch it.The right end of the conductor will be

If a conductor is in electrostatic equilibrium near an electrical charge:

Exam 15: Electric Forces and Fields

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−17 J.What is the magnitude of the electric field that will stop these electrons in a distance of 0.3 m? (e = 1.6 × 10−19 C)

Electric field is dimensionally equivalent to which of the following?

A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell.The charge q does not touch the shell.What is the charge on the outer surface of the shell?

Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm.What is the electric field midway between the two charges? (ke = 8.99 × 109 N·m2/C2) ​

At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?

Object A has a charge q on it,object B has a charge q on it,and object C has a charge 3q on it.These charges are arranged,one each,at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?​

An uncharged conductor is supported by an insulating stand.I pass a positively charged rod near the left end of the conductor,but do not touch it.The right end of the conductor will be

If a conductor is in electrostatic equilibrium near an electrical charge:

Electrons in a particle beam each have a kinetic energy of 4.0 × 10−¹⁷ J.What is the magnitude of the electric field that will stop these electrons in a distance of 0.3 m? (e = 1.6 × 10−¹⁹ C)

Two point charges each have a value of 35.5 mC and are separated by a distance of 4.0 cm.What is the electric field midway between the two charges? (k_e = 8.99 × 10⁹ N·m²/C²)

Object A has a charge q on it,object B has a charge q on it,and object C has a charge 3q on it.These charges are arranged,one each,at the vertices of an equilateral triangle.Which charge has the greatest magnitude electric force on it?