Answer:
The new energy density is same as initial energy density u0 as it is independent of plate dimensions
Explanation:
As we know that energy density is total energy per unit volume
so we know that isolated plates of capacitor is placed here

here we have energy density given as

so we have

so it is independent of the dimensions of the plate while total charge on the plates is constant always
so energy density will not change and remains the same
Answer:
The answer is 80 kN . m (clockwise)
Explanation:
As,
M = P x L
Here, the towline exerts a force is P.
Substituting P for 4000N.
M = -4000N x 20m
= -80000N.m
= 80kN.m
Maximum moment about the point O is 80kN.m (Clockwise)
Answer:
The answer is B- it decreases from 40 J to 37 J.
Explanation:
Because as you see it was at 8 then it went down 3 just like how it started at 40 and went down 3 to 37.