Answer:
(A) electric and gravitational fields but not magnetic fields.
Explanation:
Let's analyze the effect produced by each of the three fields on the stationary electron:
- Gravitational force: the gravitational force exerted on the electron by a gravitational field is
[tex]F=mg[/tex]
where
m is the mass of the electron
g is the strength of the gravitational field
Since the mass of the electron m is non-zero, the electron experiences a gravitational force.
- Electric field: the electric force exerted on the electron by an electric field is
[tex]F=qE[/tex]
where
q is the charge of the electron
E is the magnitude of the electric field
Since the charge q of the electron is non-zero, the electron experiences an electric force.
- Magnetic field: the magnetic force exerted on the electron by a magnetic field is
[tex]F=qvBsin \theta[/tex]
where
q is the electron charge
v is the velocity of the electron
B is the magnitude of the magnetic field
[tex]\theta[/tex] is the angle between the direction of v and B
Since the electron is stationary, we notice that the velocity is zero: v=0, therefore the magnetic force is zero as well.
Therefore, the correct answer is
(A) electric and gravitational fields but not magnetic fields.
Answer:
Which of the following exists around every object that has mass?
A.
a magnetic field
B.
magnetic poles
C.
a gravitational field
D.
electric charges
Explanation:
