Answer:
Time interval for which magnetic field reduced to ZERO is given as

Explanation:
As we know that the flux linked with one coil is given as


now total flux of all coils is given as

now let say the flux is reduced to ZERO after time "t"
so as per Faraday's law EMF induced in the coil is given as

now the current in the coil is given as


so the time interval is given as

Answer:
The surface charge density of the sheet is 1547.516 C/m²
Explanation:
Given;
force experienced by the proton, F = 14.0 μN
Electric field near an infinite sheet with surface charge density (σ) is given as;
E = σ/2ε₀
The force of attraction the proton experienced towards the sheet;
F = Eq
F = q(σ/2ε₀) 
where;
q is the charge of the proton
σ is the surface charge density of the sheet
ε₀ is the permittivity of free space

Therefore, the surface charge density of the sheet is 1547.516 C/m²
It will not be carried to children ... because genetic defect can be carried to children, not the defect during his lifetime
Answer:
No Refraction takes places
Explanation:
When light travels from one medium to another at an angle of incidence 0 degree then no refraction takes place .
It is because according to Refraction law
sini =
sinr
where
are the refractive index of medium of incidence and medium of refraction .
When i = 0 , left side of the equation becomes 0 and thus r (angle of refraction) must be zero. So No refraction takes place
Pass a validated official test ?