A long non-conducting cylinder has a charge density p = a r, where a = 8.26 C/m4

Question

A long non-conducting cylinder has a charge

density p = a r, where a = 8.26 C/m4

and r is in meters. Concentric around it is a hollow

metallic cylindrical shell. These are RADII, not diameter

What is the direction of the electric field at

14.7 cm from the central axis?

1. Points radially outward.

2. Undetermined, since the field is zero.

3. The electric field is not a vector and therefore has no direction.

4. Points radially inward.

What is the surface charge density inside the hollow cylinder?

(I don't want the answer, I need to know how to get the answer. I've tried many times and hate that I have to result to Chegg, but I do.)

A long non-conducting cylinder has a charge density p = a r, where a = 8.26 C/m4 and r is in meters. Concentric around it is a hollow metallic cylindrical shell. These are RADII, not diameter What is the direction of the electric field at 14.7 cm from the central axis? Points radially outward. Undetermined, since the field is zero. The electric field is not a vector and therefore has no direction. Points radially inward. What is the surface charge density inside the hollow cylinder?

Explanation / Answer

The point is inside the metal cylindar. So the Static Electric Field is ZERO. option 3 is correct.

Reason: If there is a field in radial direction, the electrons in the metal move and the field gets nullified. So electric field in a conductor is zero.

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