Question

In the ground state of atom of which model are the electrons held in equilibrium with zero net force

Answer 1

Answer:

There are two conditions for a body to be in equilibrium:

(i) Sum of forces acting on body= 0

(ii) Resultant torque = 0

If a body is in at rest, resultant force is zero. If a body is moving with uniform velocity, still the resultant force is zero. These bodies will be in equilibrium. Similarly a rotating ceiling fan is in equilibrium as net torque acting on it is zero.

Some physicists/teachers present the following two examples as bodies at rest but not in equilibrium:

1. Body at highest point when thrown upward against gravity.

2. Pendulum at its extremes.

Answer 2

Answer:

The condition Fnet=0 F net = 0 must be true for both static equilibrium, where the object's velocity is zero, and dynamic equilibrium, where the object is moving at a constant velocity. Below, the motionless person is in static equilibrium. The forces acting on him add up to zero.