Electric Field of Parallel Plates

In gel electrophoresis, DNA fragments are separated based on their size and charge. Given that DNA has a negative charge, towards which electrode would smaller DNA fragments migrate in an electric field?

• Towards the positive electrode, moving faster than larger fragments.

• Towards the negative electrode, moving faster than larger fragments.

• Towards the positive electrode, moving slower than larger fragments.

• Towards the negative electrode, moving slower than larger fragments.

What are the key characteristics of the electric field between two oppositely charged parallel plates, assuming uniform charge distribution and considering a region far from the edges?

• The electric field is perpendicular to the plates, constant in size, and constant in direction.

• The electric field is parallel to the plates, constant in size, and constant in direction.

• The electric field is perpendicular to the plates, varies in size, and constant in direction.

• The electric field is parallel to the plates, varies in size, and varies in direction.

A positively charged particle enters a uniform electric field between two parallel plates with an initial horizontal velocity. How will its motion be affected by the electric field?

• Its horizontal velocity will increase, and its vertical velocity will remain constant.

• Its horizontal velocity will remain constant, and its vertical velocity will change.

• Both its horizontal and vertical velocities will change.

• Both its horizontal and vertical velocities will remain constant.

The electric field strength (E) between two parallel plates is given by the formula E = Q / (ε₀A), where Q is the charge on the plates, ε₀ is the permittivity of free space, and A is the area of the plates. How can the electric field strength be increased?

• By decreasing the charge (Q) on the plates.

• By increasing the area (A) of the plates.

• By increasing the charge (Q) on the plates.

• By increasing the distance between the plates.

What happens to the electric field strength between two parallel plates if the charge on the plates is increased, assuming the plate area remains constant?

• It decreases.

• It increases.

• It remains the same.

• It becomes zero.

If the plate area of a parallel plate capacitor is decreased while maintaining a constant charge, how does the electric field strength between the plates change?

• It increases.

• It decreases.

• It remains constant.

• It becomes undefined.

How does decreasing the separation distance between two charged parallel plates affect the electric field strength, assuming the potential difference across the plates is kept constant?

• The electric field strength decreases.

• The electric field strength increases.

• The electric field strength remains unchanged.

• The electric field strength becomes zero.

A positively charged particle is shot horizontally into a uniform electric field directed downwards. Which of the following best describes its subsequent motion?

• It moves horizontally without any vertical deflection.

• It moves vertically downwards in a straight line.

• It follows a parabolic path, accelerating downwards.

• It follows a parabolic path, accelerating upwards.