Moving Charges & Magnetism  MCQs

MCQs of Moving Charges & Magnetism

Showing 91 to 100 out of 123 Questions
7 8 9 10 11 12
91.
One tesla is equal to _____ .
(a) 107 gauss
(b) 10-4 gauss
(c) 104 gauss
(d) 10-8 gauss
Answer:

Option (c)

92.
The dimensional formula of the magnetic field intensity B is _____ .
(a) M1L-2A-1
(b) M1T-2A-1
(c) M2TA-3
(d) M2LT-2A-1
Answer:

Option (b)

93.
A magnetic field can by produced by _____ .
(a) a moving charge
(b) a changing electric field
(c) None of these
(d) Both (A) and (B)
Answer:

Option (d)

94.
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, then the new value of the magnetic field is _____ .
(a) B
(b) 2B
(c) 4B
(d) B2
Answer:

Option (a)

95.
A beam of ions with velocity 2×105 m/s entres normally into a uniform magnetic field of 4×10-2 tesla. if the specific charge (charge per unit mass) of the ion is 5×107 C/kg, then what will be the radius of the circular path ?
(a) 0.10m
(b) 0.16m
(c) 0.20m
(d) 0.25m
Answer:

Option (a)

96.
An electron and a proton enter in a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true ?
(a) Trajectory of electron is less curved.
(b) Trajectory of proton is less curved.
(c) Both trajectories are equally curved.
(d) Both move in straight line path.
Answer:

Option (b)

97.
An electron is moving along positive X-axis. To get it moving on an anticlockwise circular path in X-Y plane, a magnetic field is applied ____ .
(a) along positive Y-axis
(b) along positive Z-axis
(c) along negative Y-axis
(d) Along negative Z-axis
Answer:

Option (b)

98.
An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angle to a uniform magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius of _____ .
(a) r4
(b) r2
(c) 2r
(d) 4r
Answer:

Option (d)

99.
A paricle of mass 0.6 g and having charge of 25 nC is moving horizontally with a uniform velocity 1.2x104 ms-1 in a uniform magnetic field. What is the value of the magnetic induction ? (g=10 ms-2)
(a) zero
(b) 10T
(c) 20T
(d) 200T
Answer:

Option (c)

100.
A circular coil of radius 4 cm and of 20 turns carries a current of 3 Ampere. it is placed in a magnetic field at intensity of 0.5 weber/m2. What is the magnetic dipole moment of the coil ?
(a) 0.15 Ampere m-3
(b) 0.3 ampere m-3
(c) 0.45 Ampere m-3
(d) 0.6 Ampere m-3
Answer:

Option (b)

Showing 91 to 100 out of 123 Questions
7 8 9 10 11 12