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The electric field intensity produced by the radiations

Question:

The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is

(a) E/2

(b) 2E

(c) E/√2

(d) √2E

Solution:

(c) E/√2

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