Class 12-science H C VERMA Solutions Physics Chapter 18 - Electromagnetic Waves
339
Electromagnetic Waves Exercise 339
Solution 1
Dimensions of displacement current 
is given as:
Also, dimension of electric current 
dimension of
∴ Displacement current and electric current is same.
Solution 2
By coloumb's law,
Also, we know,
Solution 3
We know,
Solution 4
We know,
Solution 5
We know
And
Dimensions is given as:
=[R]
∴ Ratio is called impedance of free space.
Solution 6
We know.
Solution 7
a) According to question,
And 
b) Average density is given as:
=0.016J/m3
Solution 8
We know,
And
=1.44T
Solution 9
We know,
Also,
