Electrostatics 1 Question 17
18. An infinitely long solid cylinder of radius has a uniform volume charge density . It has a spherical cavity of radius with its centre on the axis of the cylinder, as shown in the figure. The magnitude of the electric field at the point , which is at a distance from the axis of the cylinder, is given by the expression .
The value of
(2012)
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Answer:
Correct Answer: 18. (b)
Solution:
- Volume of cylinder per unit length
is
Now at
Substituting the values, we have