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


13.
The magnetic force on a charged particle does not:
A.
Affect speed
B.
Both B and C
C.
Change direction of motion
D.
Do any work
😑 View Answer Rough Work Error
ANSWER :
B. Both B and C
14.
A charged particle of mass m and charge q, moving with velocity v, enters a magnetic field B at 30° to the direction of B. The radius of circular motion is:
A.
mv tan30°/(qB)
B.
mv/(qB)
C.
mv cos30°/(qB)
D.
mv sin30°/(qB)
😑 View Answer Rough Work Error
ANSWER :
D. mv sin30°/(qB)
15.
A proton and an alpha particle having same KE enter a magnetic field perpendicular to B. The ratio of their radii r_p:r_α is:
A.
1 : 2
B.
2 : 1
C.
1 : 1
D.
1 : √2
😑 View Answer Rough Work Error
ANSWER :
C. 1 : 1
16.
In a cyclotron, the frequency of the alternating voltage must match:
A.
Twice the frequency of particles
B.
Half the cyclotron frequency
C.
Frequency of electric field
D.
The cyclotron frequency of the particles
😑 View Answer Rough Work Error
ANSWER :
D. The cyclotron frequency of the particles
17.
The SI unit of magnetic field B derived from Lorentz force is:
A.
N/A
B.
V·s/m
C.
N·C/m
D.
N·s/(C·m) or Tesla
😑 View Answer Rough Work Error
ANSWER :
D. N·s/(C·m) or Tesla
18.
A positive charge moving in +x direction in a field B along +y direction experiences force:
A.
Along -x direction
B.
Along +y direction
C.
Along +z direction
D.
Along -z direction
😑 View Answer Rough Work Error
ANSWER :
C. Along +z direction