Which reason best explains why plasmas are good conductors of electricity? they have mobile charged particles. they are at extremely high temperatures. they are made up of particles in fixed positions. they have slow-moving nuclei that carry electricity.

Option (a) is the correct answer.

Explanation:

Plasma is a state of matter which consists of hot ionized gas that has same number of positively charged ions and negatively charged electrons.

Being hot in nature, particles in plasma move more rapidly.

Thus, we can conclude that out of the given options, plasma's are good conductors of electricity because they have mobile charged particles.

they have mobile charged particles

Explanation:

option a on edge

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.