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Magnetic Flux and Magnetic Flux Density

The intensity...

Question

The intensity of light at a distance 'r' from the axis of a long cylindrical source is inversely proportional to r.
A)True
B)False
explain the answer in detail.

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Solution

$A c c o r d i n g t o t h e d e f i n i t i o n o f l u m i n o u s i n t e n s i t y, l u m i n o u s f l u x f a l l i n g o n u n i t a r e a o f t h e s u r f a c e i s g i v e n b y, E = \frac{I}{r^{2}} S i n c e t h e i n t e n s i t y o f l i g h t f a l l i n g n o r m a l l y o n t h e u n i t s o l i d s u r f a c e a r e a i s c o n s \tan t, s o E α \frac{1}{r^{2}} T h e r e f o r e t h e o p t i o n (A) T r u e i s t h e r i g h t c h o i c e .$

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