Force on a Moving Charge in Uniform Magnetic and Electric Fields NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Force on a Moving Charge in Uniform Magnetic and Electric Fields MCQ Questions


1.
The Lorentz force on a charged particle moving with velocity v in the presence of electric field E and magnetic field B is:
A.
F = qE × v × B
B.
F = qE + qvB
C.
F = qE × B + qv
D.
F = q(E + v × B)
😑 View Answer Rough Work Error
ANSWER :
D. F = q(E + v × B)
2.
A charged particle moves with constant velocity in a region. Which of the following is possible?
A.
Both E and B zero, or E and B such that forces cancel, or v parallel to B with no E
B.
Only E is present
C.
Only B is present with v parallel to B
D.
E and B both perpendicular to v
😑 View Answer Rough Work Error
ANSWER :
A. Both E and B zero, or E and B such that forces cancel, or v parallel to B with no E
3.
The work done by magnetic force on a charged particle moving in a magnetic field is:
A.
Always zero
B.
Always positive
C.
Equal to qvB
D.
Maximum when v is perpendicular to B
😑 View Answer Rough Work Error
ANSWER :
A. Always zero
4.
A charged particle enters a uniform magnetic field with velocity perpendicular to B. Its trajectory is:
A.
Parabolic
B.
Straight line
C.
Circular
D.
Helical
😑 View Answer Rough Work Error
ANSWER :
C. Circular
5.
The radius of circular motion of a charged particle in a magnetic field is:
A.
mv/(qB)
B.
mvB/q
C.
qB/(mv)
D.
qvB/m
😑 View Answer Rough Work Error
ANSWER :
A. mv/(qB)
6.
The time period of revolution of a charged particle in a magnetic field is:
A.
T = 2πmv/(qB)
B.
T = qB/(2πm)
C.
T = 2πm/(qB)
D.
T = 2πqB/m
😑 View Answer Rough Work Error
ANSWER :
C. T = 2πm/(qB)