Hi there!
We can use the rotational equivalent of Newton's Second Law:

Στ = Net Torque (Nm)
I = Moment of inertia (kgm²)
α = Angular acceleration (rad/sec²)
We can plug in the given values to solve.

Answer:B
Explanation: I think this is the answer
Answer:
The value of the electric field is 
Explanation:
We know that the electric field inside a solid cylinder at a distance
from the centre is given by

Let's consider the cross-section of the cylinder as shown in the figure. Let `O' be the centre of the long solid insulating cylinder having radius 'R'. Also consider that
be the cetre of the hole of radius 'a' situated at a distance 'b' from 'O'. Given, the volume charge density of the material is 'r'. So, the volume charge density inside the hole will be '-r'. Let's consider 'P' be any arbitrary point inside the hole situated at a distance 's' from
.
So, the electric field '
' due to the long cylinder at point 'P' is given by

and the electric field '
'due to the hole at point 'P' is given by

So the net electric field (
) inside the hole is given by

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