Answer:
Explanation:
Distance between two slits d = .038 x 10⁻³m
Distance of screen L = 1.6 m
Wave-length of light λ = 4750 x 10⁻¹⁰ m
If x₁ be the position of first bright fringe on the screen
Sinθ₁ = x₁ / L
For position of second bright fringe
Sinθ₂ = x₂ / L
Again, for the formation of first bright fringe
a ) path difference = λ
x₁ d / L = λ
d Sinθ₁ = λ
Sinθ₁ = λ / d
b ) Similarly for second bright fringe
Sinθ₂ = 2 λ / d
c ) Distance between two bright fringes
x₂ - x₁ = y
y = L ( Sinθ₂ - Sinθ₁ )
d )
y = L ( Sinθ₂ - Sinθ₁ )
= L ( 2 λ / d - λ / d )
= Lλ / d
=
= 2 x 10⁻² m
= 2 cm .
Answer:
Explanation:
Since the Earth's magnetic field is perpendicular to your direction of motion, the strength of the magnetic force exerted on your head is given by:
where:
is the charge on your head
is the speed at which you are moving
is the strength of the magnetic field of the Earth
By substituting these numbers into the equation, we find the strength of the magnetic force:
Answer:
Explanation:
We know that for a capacitor , where <em>Q </em>is the charge of one plate, <em>C</em> the capacitance and <em>V</em> the potential between the plates.
We also know that , since
is the surface charge density and <em>A</em> the area of the plate (both equal in our case).
Putting all together:
Which for our values is:
Where we notice that the S.I. units combination FV/C must not have units (we can verify it directly from their definitions or we notice that is enough to describe an area).