TG EAMCET 3 May 2025 Shift 2 Paper

Step 1: Write the formula connecting intensity and electric field.
The formula for the intensity ( I ) of a light beam in terms of the amplitude of the electric field ( E0 ) is:
I=‌

1

2

ε0cE02
where ε0 is the permittivity of free space, and c is the speed of light.
Step 2: Rearrange the formula to find E0.
E0=√‌

2I

ε0c

Step 3: Substitute the given values into the formula.
Given: I=‌

15

π

Wm−2,ε0=8.85×10−12C2∕N⋅m2,c=3×108m∕s
E0=√‌

2× 15 π

8.85×10−12×3×108

Step 4: Calculate the value.
When you solve the above, you get:
E0=60NC−1