Question 1 When a positively charged object is brought near a grounded object (w

Question

Question 1

When a positively charged object is brought near a grounded object (without touching) the force between the objects is:

a) attractive because a negative charge is induced in the grounded object.

b) zero because no charge is induced.

c)

repulsive because a positive charge is induced in the grounded object.

Question 2

Originally a small sphere carries a positive charge. After the sphere has been grounded (brought in close contact with a grounded object) the excess charge on the sphere:

a)

is essentially zero.

b)

is positive and exactly the same as it was originally.

c)

is positive but only half of what it was originally.

d)

is negative.

Question 3

The electric field near a uniformly charged plane is:

a) Proportional to the surface charge density.

b)

Inversely proportional to the surface charge density.

c) Independent of the surface charge density.

Question 4

The Coulomb force between two point particles has a magnitude of 10-3 N.

The particles carry identical charges of 10 nC = 10-8 C. What is the distance between the particles?

a) 0.9 mm

b)

3 cm

c)

3 m

d)

9 m

a) attractive because a negative charge is induced in the grounded object.

b) zero because no charge is induced.

c)

repulsive because a positive charge is induced in the grounded object.

Explanation / Answer

a) attractive because a negative charge is induced in the grounded object.

a)

is essentially zero.

a) Proportional to the surface charge density

and last answer

3 cm

a)

is essentially zero.

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