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Question 1
Value of permittivity of free space?
Question 2
If the magnetic field of a plane electromagnetic wave is given by (The speed of light = 3 × 108 m/s)
Then the maximum electric field associated with it is :
Then the maximum electric field associated with it is :
Question 3
If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be
Question 4
Consider the following statements :
A real image –
1) can be formed on a screen
2) is always magnified and inverted
Which of the statements given above is/ are correct?
Question 5
Two conducting wires A and B are made of same material. If the length of B is twice that of A and the radius of circular cross-section of A is twice that of B, then their resistances RA and RB are in the ratio
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