Answer:
The length is and the angle is
Explanation:
The period of the pendulum is related to its length
by
where is the acceleration due to gravity.
Solving for we get
putting in and
we get:
There are two forces acting on the pendulum: The gravitational force and the
student's force. Therefore, the angular displacement
that these forces give is
putting in ,
, and
we get
The sphere has a constant potential. It is the electric field.
In the sphere, then
Outside the sphere, then
The elements of the electric field include
Which becomes,
Similar to an ordinary object in the uniform gravitational field near the Earth's surface, a charged item in a uniform electric field experiences a constant force and consequently experiences a uniform acceleration. The vector cross product of p and E determines the torque's direction.
If the charge is positive, the force either moves in the same direction as E or in the opposite direction (if charge is negative).
A torque is experienced by an electric dipole (p) in an even electric field (E). The vector cross product of p and E determines the torque's direction.
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