1- At certain instant, a proton is moving in the positive x direction through a
ID: 1552777 • Letter: 1
Question
1- At certain instant, a proton is moving in the positive x direction through a magnetic field in the negative z direction. what is the direction of the magnetic force exerted on the proton? Explain!
a) positive z direction
b) negative z direction
c) positive y direction
d) negative y direction
e) The force is zero
2- Electron a is fired horizontally with speed 1.00 mm/s into a region where a vertical magnetic field exists. electron B is fired along the same path with speed 2.00 Mm/s. which electron has a larger magnetic force exerted on it? Explain!
a) A does
b) B does
c) The forces have the same nonzero magnitude
d) The forces are both zero
3- A spatially uniform magnetic field cannot exert a magnetic force on a particle in which of the following circumstances? There may be more than one correct statement. Explain!
a) The particle is charged.
b) The particle moves perpendicular to the magnetic field.
c) The particle moves parallel to the magnetic field.
d) The magnitude of the magnetic field changes with time.
e) The particle is at rest.
4- A thin cobber rod 1.00 m long has a mass of 50.0 g. hat is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T? Explain!
a) 1.20 A
b) 2.40 A
c) 4.90 A
d) 9.80 A
Explanation / Answer
1)
here,
direction of velocity is in +x direction
the magnetic force is in negative z direction
so the magnetic force , F = q * ( v X B)
F = ( i X ( -k)) direction
F = j direction
the direction of the magnetic force on the proton is c) positive y direction
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