In a capacitor with a dielectric, what effect does polarization have on the electric field?

In a capacitor with a dielectric, what effect does polarization have on the electric field?

• A. It creates an opposing field that reduces the effective electric field
• B. It increases the magnetic field
• C. It shorts the circuit
• D. It causes the dielectric to heat

Answer: (A)

Polarization in a dielectric means the molecules align and develop bound charges on their surfaces. These bound charges create a field that points opposite to the applied field, so the net electric field inside the dielectric is smaller than it would be in empty space. This reduction in the internal field is what allows the capacitor to store more charge for the same voltage, effectively increasing its capacitance. The magnetic field isn’t inherently increased by polarization in a static situation, and shorting the circuit or heating the dielectric aren’t the primary effects of polarization. So the main consequence is the opposing field that lowers the effective electric field inside the dielectric.

Polarization in a dielectric means the molecules align and develop bound charges on their surfaces. These bound charges create a field that points opposite to the applied field, so the net electric field inside the dielectric is smaller than it would be in empty space. This reduction in the internal field is what allows the capacitor to store more charge for the same voltage, effectively increasing its capacitance. The magnetic field isn’t inherently increased by polarization in a static situation, and shorting the circuit or heating the dielectric aren’t the primary effects of polarization. So the main consequence is the opposing field that lowers the effective electric field inside the dielectric.