Answer:
good question, did you press any certain buttons?
Explanation:
A) We need to calculate the Magnetic flux of a Solenoid,

Where B is the magnetic field and A the Area.

Here \mu_0 is the permeability constant, I the current and N number of turns.
Replacing we have,



B) We calculate the mutual inductance, so



c) We calculate the emf



Speed equals distance times time
Answer:
Net charge contained in the cubeq= 3.536×10^-6C
Explanation:
Formular for total flux in a cube is given as:
Total flux= E300Acos(180) + E200Acos(0)
Where A is crossectional area
Total flux= A(E200-E300)
Total flux= q/Eo
q= Eo×total flux
q=(8.84×10^-12)×(100)^2×(100-60)
q= 3.536×10^-6C