Question

When the dielectric is placed in an external electric field, the electric field inside the dielectric is

• A. larger than the external electric field.
• B. less than the external electric field.
• C. equal to the external electric field.
• D. equal to or greater than external electric field.

Hint:

Polarisation produces an opposing field, so the net field inside is reduced.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
A dielectric placed in an external field gets polarised.

Step 2: Induced field
Bound surface charges produce a field opposite to the external field.

Step 3: Net field
\(E=E_0-E_{ind}=\dfrac{E_0}{K}\), and since \(K>1\), the field is less than \(E_0\).

Final Answer:
The field inside the dielectric is less than the external field. \[ \boxed{\text{(B) }\text{less than the external electric field}} \]