please show steps A point source at O radiates electromagnetic waves isotropical

Question

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A point source at O radiates electromagnetic waves isotropically. A book is placed at point C. which is at some distance away from the source along the positive y-axis. Let the point source in the sketch be a light bulb which has an average power of 860 W. The distance between the bulb and the book at C is 1.2 m. The area of the book which is perpendicular to the y-axis is 0.36 m^2. The speed of light is 2.99792 times 10^8 m/s and the permeability of free space is 4 pi times 10^-7 T N/A. Find the maximum magnetic field at the book. Answer in units of T.

Explanation / Answer

P =860 W, A =0.36 m^2

Intenisty = P/A

I = (1/2uo)(B^2c)= P/A

(B^2*3*10^8)/(2*4*3.14*10^-7) = 860/0.36

B = 4.47*10^-6 T

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