Question

Part A

For the charge distribution provided, indicate the region (A to E) along the horizontal axis where a point exists at which the net electric field is zero. (Figure 1)

If no such region exists on the horizontal axis choose the last option (nowhere).

	a.) A
	b.) B
	c.) C
	d.) D
	e.) E
	f.) nowhere

Part B

For the charge distribution provided, indicate the region (A to E) along the horizontal axis where a point exists at which the net electric field is zero. (Figure 2)

If no such region exists on the horizontal axis choose the last option (nowhere).

	a.) A
	b.) B
	c.) C
	d.) D
	e.) E
	f.) nowhere

Part C

For the charge distribution provided, indicate the region (A to E) along the horizontal axis where a point exists at which the net electric field is zero. (Figure 3)

If no such region exists on the horizontal axis choose the last option (nowhere).

	a.) A
	b.) B
	c.) C
	d.) D
	e.) E
	f.) nowhere

Part D

For the charge distribution provided, indicate the region (A to E) along the horizontal axis where a point exists at which the net electric field is zero. (Figure 4)

For the charge distribution provided, indicate the region (A to E) along the horizontal axis where a point exists at which the net electric field is zero.

a.)	A
b.)	B
c.)	C
d.)	D
e.)	E
f.)	Nowhere along the finite x axis

Answer 1

Electric Field of Point Charge

The electric field of a point charge can be obtained from Coulomb's law: The electric field is radially outward from the point charge in all directions. The circles represent spherical equipotential surfaces.

The electric field from any number of point charges can be obtained from a vector sum of the individual fields. A positive number is taken to be an outward field; the field of a negative charge is toward it.

so by using the formula, we get

1 C the direction of the field at point c is equal and opposite to it is zero at this point

2 B the direction of the field at point b is opposite and will be equal in magnitude at a distance of (B+D)/3 from q.be zero

3 F no such region exist

4 A the direction of the field at point a is opposite and will be equal in magnitude at a distance (B+D) from q.