Why is the linear portion of the triode characteristic chosen to operate the triode as an amplifier?

A triode is operated in the liner region of its characteristics. If the plate voltage is slightly increased, the dynamic plate resistance will

The specific characteristic of a common emitter amplifier is

The plate current in a triode valve is maximum when the potential of the grid is

Two charged conducting spheres of radii a and b are connected to each other by a wire. What is the ratio of electric fields at the surfaces of the two spheres? Use the result obtained to explain why charge density on the sharp and pointed ends of a conductor is higher than on its flatter portions.

Figure shows a smasll sphereical bal of mass m rolling down the loop track. Thebasll is released on the linear portion at a verticla height H from the lowest point. The circular part show has a radius R. a. find the kinetic energy of the ball when it is at a point where the radius makes an angle theta with the horizontal. Find the radial and the tangential accelerations of the cente when the ball is at A. c. find the bnormal force and the frictionasl force acting on the ball if H=60 cm, R=10cm theta=0 and m=70 fg.