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1. Providence- Rhode Island
2. Philadelphia- Pennsylvania
3. St. Mary’s- Maryland
4. Plymouth and Boston- Massachusetts
5. Charleston- South Carolina
6. Savannah- Georgia
7. Hartford- Connecticut
8. New Amsterdam- New York
9. Jamestown- Virginia
Answer:
A solenoid is a type of electromagnet, the purpose of which is to generate a controlled magnetic field through a coil wound into a tightly packed helix. The coil can be arranged to produce a uniform magnetic field in a volume of space when an electric current is passed through it.
Answer:
B is correct. Electrons are added to the rod.
Explanation:
Because the fur lose electrons to the rode and because positively charged while the rod because negative
Answer:
y = L h / a √√ (2q V m)
Explanation:
This is a diffraction exercise, so we must use the D'Broglie relation to encode the wavelength of the electron beam.
p = h / λ
λ= h / p
the moment is
p = m v
λ = h / mv
Let's use energy conservation
E = K
q ΔV = ½ m v²
v = √ 2qΔv / m
λ = h / (m √2q ΔV / m)
λ = h / √ (2q ΔV m)
Having the wavelength of the electrons we can use the diffraction ratio
a sin θ = m λ
First minimum occurs for m = 1
sin θ = λ / a
let's use trigonometry for the angles
tan θ = y / x
as in these experiments the angles are very small
tan θ = sin θ / cos θ = sin θ
sin θ = y / x
we substitute
y / x = λ / a
y = x λ / a
we replace the terms
y = L h / a √√ (2q V m)