(a)
In a velocity selector, the speed of the beam is related to the magnitude of the electric field and of the magnetic field by the formula:
where
E is the magnitude of the electric field
B is the magnitude of the magnetic field
In this problem, we have
(magnetic field)
(speed of the particles)
Solving the equation for E, we find the electric field:
(b) 3.2 kV
The relationship between electric field and potential difference between the two plates is:
where, in this problem:
is the magnitude of the electric field
is the separation between the plates
Substituting into the equation, we find the potential difference:
The resultant<span> is the vector sum of 2 or more vectors. It is the conclusion of adding 2 or more vectors together. If </span>displacement <span>vectors A, B, and C are added together, the result will be vector R.</span>
Answer: B
Action and reaction forces act on the same object and go to the same direction
Answer:
8000 kg/m^3
Explanation:
Weight in air = 7.84 n
Weight in water = 6.86 N
density of water = 1000 kg/m^3
Let d be the density of object
According to the Archimedes principle, when a body is immersed in a liquid partly or wholly, it experiences an upward force which is called buoyant force. The buoyant force is equal to the loss in weight of the body.
Loss in weight of the object = Weight of object in air - weight of object in water
Loss in weight = 7.84 - 6.86 = 0.98 N
Volume of body x density of water x g = 0.98
Let V be the volume of body
V x 1000 x 9.8 = 0.98
V = 10^-4 m^3
Weight in air = Volume of body x density of body x g
7.84 = 10^-4 x d x 9.8
d = 8000 kg/m^3
Thus, the density of body is 8000 kg/m^3.