Asinusoidally-varying voltage v(t)=v0sin(2pift) with amplitude v0 = 10 v and frequency f = 100 hz is impressed across the plates of a circular-shaped parallel plate air-gap capacitor of radius a = 1.0 cm and plate separation d = 0.01 mm. the amplitude of maxwell's displacement current id flowing across the gap between the plates of this capacitor is?

Id=1.75×10⁻⁶A

Explanation:

The flux formula

Iₐ=ε(dФ/dt)

The electric flux is

ФE=E.A

ФE=EA={V(t)/d}πa²

The electric field inside of a parallel plate capacitor points in straight lines of constant field from one plate to the other. Using this form, we can take a derivative to quickly obtain

Id=(2π²a²ε₀V₀f/d)cos(2πft)

putting values

we get Id=1.75×10⁻⁶A

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.