Question
Physics Question on Magnetism and Maxwell's Equations
A 15.7mW laser beam has a diameter of 4mm. If the amplitude of the associated magnetic field is expressed as ε0c3A , the value of A is: (𝜀0 is the free space permittivity and 𝑐 is the speed of light)
A
50
B
35.4
C
100
D
70.8
Answer
50
Explanation
Solution
The correct option is (A): 50