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NCERT Solutions for class 12 Physics | Chapter 4 - Moving Charges and Magnetism

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Free download in PDF Class 12 Physics Chapter 4 Moving Charges and Magnetism Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) Tesla is a unit of:
[A] electric flux
[B] magnetic flux
[C] magnetic field
[D] electric field
Answer: magnetic field
(2) A cyclotron can be used to produce high energy:
[A] neutrons
[B] deutrons
[C] β particles
[D] α partifcles
Answer: α partifcles

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(3) Two identical bar magnets each of dipole moment p and length I are perpendicular to each other as shown in Fig. The dipole moment of the combination is:

[A] √2 p
[B] p/√2
[C] P
[D] 2p
Answer: √2 p
(4) An electron having mass ‘m’ and Kinetic energy E enters in uniform magnetic field B perpendicular, then its frequency will be:
[A] eE/qmB
[B] 2πm/eB
[C] eB/2πm
[D] 2m/eBE
Answer: eB/2πm
(5) The torque acting on a magnetic dipole of moment when placed in a magnetic field
[A] pmB
[B]
[C]
[D]
Answer:
(6) A charge q moves in a region, where electric field E and magnetic field B both exist, then force on it is :
[A]
[B]
[C]
[D]
Answer:
(7) A charged particle of mass m and charge q travels on a circular path of radius r i.e., perpendicular to the magnetic field B. The time taken by particle to complete on revolution is :
[A] 2πqB/m
[B] 2πm/qB
[C] 2πmq/B
[D] 2πq2B/m
Answer: 2πm/qB
(8) The permeability of a paramagnetic substance is:
[A] very large
[B] small but more than unity
[C] less than unity
[D] negative
Answer: small but more than unity
(9) A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to:
[A] sin θ
[B] cos θ
[C] cot θ
[D] tan θ
Answer: cos θ
(10) The current sensitibility of a moving coil galanometer increases with decrease in:
[A] magnetic field
[B] area of a coil
[C] number of turns
[D] None of these
Answer: None of these
(11) In thomson spectrograph then velocity of electron beam will be:
[A]
[B]
[C]
[D] E² / B²
Answer:
(12) The force experienced by a particle of charge q moving with velocity in a magnetic field is given by,
[A]
[B]
[C]
[D]
Answer:
(13) According to Ampere’s Circuital law
[A]
[B]
[C]
[D]
Answer: B
(14) A positive charge enters in a magnetic field and travels parallel to but opposite the field. If experiences
[A] an upward force.
[B] a downward force.
[C] an accelerated force.
[D] no force.
Answer: an accelerated force.
(15) An electron is projected along the axis of a circular conductor carrying the same current. Electron will experience
[A] a force along the axis.
[B] a force perpendicular to the axis.
[C] a force at an angle of 4° with axis.
[D] no force experienced.
Answer: no force experienced.
(16) The gyro-magnetic ratio of an electron in an H-atom, according to Bohr model, is
[A] independent of which orbit it is in.
[B] neutral
[C] positive
[D] increases with the quantum number n.
Answer: independent of which orbit it is in.
(17) A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B, such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is
[A] irB.
[B] 2πriB
[C] zero
[D] πriB
Answer: zero
(18) If the beams of electrons and protons move parallel to each other in the same direction, then they
[A] attract each other.
[B] repel each other.
[C] no relation.
[D] neither attract nor repel.
Answer: repel each other.
(19) A current loop placed in a non-uniform magnetic field experiences
[A] a force of repulsion.
[B] a force of attraction.
[C] a torque but not force.
[D] a force and a torque.
Answer: a force and a torque.
(20) The maximum current that can be measured by a galvanometer of resistance 40 Ω is 10 mA. It is converted into voltmeter that can read upto 50 V. The resistance to be connected in the series with the galvanometer is
[A] 2010 Ω
[B] 4050 Ω
[C] 5040 Ω
[D] 4960 Ω
Answer: 4960 Ω

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