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


7.
The cyclotron frequency of a charged particle is:
A.
Proportional to kinetic energy
B.
Proportional to radius
C.
Independent of velocity
D.
Proportional to velocity
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ANSWER :
C. Independent of velocity
8.
An electron and a proton enter a magnetic field perpendicularly with same kinetic energy. The ratio of their radii (electron:proton) is:
A.
โˆš(m_e/m_p) : 1
B.
m_p : m_e
C.
m_e : m_p
D.
1 : 1
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ANSWER :
A. โˆš(m_e/m_p) : 1
9.
A charged particle moves in a magnetic field B with velocity having components both parallel and perpendicular to B. Its trajectory is:
A.
Circle
B.
Helix
C.
Straight line
D.
Parabola
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ANSWER :
B. Helix
10.
Pitch of the helical path of a charged particle in a uniform magnetic field B is:
A.
2ฯ€m/(qB)
B.
2ฯ€mv_perpendicular/(qB)
C.
2ฯ€mv_parallel/(qB)
D.
mv_perpendicular/(qB)
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ANSWER :
C. 2ฯ€mv_parallel/(qB)
11.
A charge q moves with velocity v along the x-axis in a region with B along +y axis. The force on the charge is:
A.
qvB along +z
B.
qvB along +y
C.
qvB along -x
D.
qvB along -z
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ANSWER :
D. qvB along -z
12.
A velocity selector consists of perpendicular E and B fields. Particles of velocity v pass undeflected when:
A.
v = B/E
B.
v = E/B
C.
v = EB
D.
v = E ร— B
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ANSWER :
B. v = E/B