Electric Field

What happens to the electric field if the distance between two point charges is halved?

The field quadruples (increases by a factor of 4), because the electric field is inversely proportional to the square of the distance between charges.

What happens to the electric field inside a charged conductor in electrostatic equilibrium?

The electric field inside a conductor is zero in electrostatic equilibrium.

What is the relationship between the electric field and the potential difference between two points in a uniform electric field?

The electric field is proportional to the potential difference and inversely proportional to the distance between the points:

E = v/d

What happens to the electric field when the magnitude of a charge is doubled?

The electric field doubles because the electric field is directly proportional to the magnitude of the charge.

What is the electric field at the center of a uniformly charged ring?

The electric field at the center of a uniformly charged ring is zero because the contributions from all charge elements cancel each other out.

What is the electric potential energy of a system of two charges?

The electric potential energy is positive if the charges have the same sign (repulsive) and negative if they have opposite signs (attractive).

If the electric potential at a point is increasing in the direction of the electric field, which direction is the electric field pointing?

The electric field is pointing toward the positive charge, since electric field lines point from regions of higher to lower potential.

What is the electric field at a point just outside a spherically symmetric charged shell?

The electric field is equal to the field from a point charge at the center of the shell. The shell behaves like a point charge for points outside it.

How does the electric force between two charges change if the distance between them is tripled?

The force decreases by a factor of 3^2 = 9 because the force is inversely proportional to the square of the distance.

If two charges are of opposite sign, how do their electric field lines behave?

The electric field lines point toward the negative charge and away from the positive charge, forming a path from positive to negative.

What is the electric field created by a positive point charge?

The electric field points away from the positive charge.

What is the electric field created by a negative point charge?

The electric field points toward the negative charge.

What happens to the electric field inside a hollow charged conductor?

The electric field inside a hollow charged conductor is zero due to the shielding effect of the conductor.

What is the formula for the electric field created by a point charge?

The electric field created by a point charge is given by:

𝐸 =𝑘∣𝑄∣ / r^2

where E is the electric field, k is Coulomb's constant, Q is the charge, and r is the distance from the charge.

What is the unit of electric field?

The unit of electric field is newtons per coulomb (N/C).

If the electric potential at a point is constant, what is the electric field at that point?

If the electric potential at a point is constant, what is the electric field at that point?

What happens to the electric field due to a point charge as the distance from the charge increases?

As the distance from the charge increases, the electric field decreases according to the inverse square law.