Physics quiz 2

What is the direction of the electric field at a point?

a. In the direction of the force on a negative test charge

b. In the direction of the force on a positive test charge

c. Perpendicular to the force on a positive test charge

d. Perpendicular to the force on a negative test charge

b

Which of the following statements is true about the electric field intensity (E) at a point in space?

a. It is the force experienced by a positive test charge divided by the magnitude of the test charge.

b. It is the force experienced by a negative test charge multiplied by the magnitude of the test charge.

c. It is the potential energy of a positive test charge placed at that point.

d. It is the potential energy of a negative test charge placed at that point.

a

The SI unit of electric field intensity is:

a. Coulomb (C)

b. Newton per Coulomb (N/C)

c. Volt (V)

d. Joule per Coulomb (J/C)

b

If the electric field intensity at a point is zero, which of the following statements must be true?

a. There are no charges in the vicinity.

b. The net force on a test charge placed at that point is zero.

c. The electric potential at that point is zero.

d. The electric potential energy at that point is zero.

b

Which of the following best describes the electric field lines around a positive point charge?

a. They radiate outwards.

b. They radiate inwards.

c. They form closed loops.

d. They are parallel lines

a

In a uniform electric field, the electric field lines are:

a. Curved

b. Radial

c. Parallel and equally spaced

d. Perpendicular to each other

c

Electric potential at a point in an electric field is defined as:

a. The work done in moving a unit positive charge from infinity to that point

b. The work done in moving a unit negative charge from infinity to that point

c. The force experienced by a unit positive charge at that point

d. The force experienced by a unit negative charge at that point

a

The SI unit of electric potential is:

a. Joule (J)

b. Coulomb (C)

c. Volt (V)

d. Newton (N)

c

If the electric potential at a point is 5 V, what is the electric potential energy of a 2 C charge placed at that point?

a. 10 J

b. 2.5 J

c. 5 J

d. 7 J

a

A positive charge moves from a point with high potential to a point with low potential. What happens to its electric potential energy?

a. It increases.

b. It decreases.

c. It remains the same.

d. It becomes zero.

b

Two points A and B are at electric potentials of 12 V and 5 V respectively. What is the work done by the electric field in moving a 1 C charge from A to B?

a. 7 J

b. -7 J

c. 12 J

d. -12 J

b

The potential difference between two points is 20 V. How much work is required to move a 0.5 C charge between these points?

a. 10 J

b. 20 J

c. 30 J

d. 40 J

a

Which of the following statements is true about equipotential surfaces?

a. They are always perpendicular to electric field lines.

b. The work done in moving a charge along an equipotential surface is non-zero.

c. They can intersect each other.

d. They are always spherical in shape.

a

Why do electric field lines never intersect?

i. They represent a repulsive force between themselves.

ii. They always originate from positive charges and terminate on negative charges.

iii. They cannot exist in a vacuum.

iv. If they intersected, it would indicate two different directions for the electric field at the same point, which is impossible.

iv

Two electrically charged objects with charges q1=1×10^-9C and q2=2×10^-9C are separated by 1.0m. Where with respect to charge 1 should you place a third electrically charged object so that the net force exerted on it by the first 2 objects is 0?