CBSE Class 12 Physics Moving Charges and Magnetism MCQs with answers available in Pdf for free download. The MCQ Questions for Class 12 Physics with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 12 by CBSE, NCERT and KVS. Multiple Choice Questions are an important part of Term 1 and Term 2 exams for Grade 12 Physics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for NCERT Class 12 Physics and also download more latest study material for all subjects
Moving Charges and Magnetism Class 12 Physics MCQ
Class 12 Physics students should refer to the following multiple-choice questions with answers for Moving Charges and Magnetism in standard 12. These MCQ questions with answers for Grade 12 Physics will come in exams and help you to score good marks
Moving Charges and Magnetism MCQ Questions Class 12 Physics with Answers
Question: Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field B such that
(a) B is perpendicular of
(b) B is parallel to v
(c) it obeys inverse cube law
(d) it is along the line joining the electron and point of observationt
Answer: A
Question: A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the y-z plane.
(a) The magnitude of magnetic moment now diminishes
(b) The magnetic moment does not change
(c) The magnitude of B at (0, 0, z), z > R increases
(d) The magnitude of B at (0, 0, z), z >> R is unchanged
Answer: A
Question: An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
(a) The electron will be accelerated along the axis
(b) The electron path will be circular about the axis
(c) The electron will experience a force at 45° to the axis and hence execute a helical path
(d) The electron will continue to move with uniform velocity along the axis of the solenoid
Answer: D
Question: In a cyclotron, a charged particle
(a) undergoes acceleration all the time
(b) speeds up between the dees because of the magnetic field
(c) speeds up in a dees
(d) slows down within a dee and speeds up between dees
Answer: A
Question: If we double the radius of a coil keeping the current through it unchanged, then the magnetic field at any point at a large distance from the centre becomes approximately
(a) double
(b) three times
(c) four times
(d) one-fourth
Answer: C
Question: A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV the energy acquired by the alpha particle will be:
(a) 0.5 MeV
(b) 1.5 MeV
(c) 1 MeV
(d) 4 MeV
Answer: C
Question: A charged particle moving in a uniform magnetic field and losses 4% of its kinetic energy. The radius of curvature of its path changes by
(a) 2%
(b) 4%
(c) 10%
(d) 12%
Answer: C
Question: Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2, respectively. The ratio of masses of X
(a) (R1/R2)1/2
(b) (R2/R1)
(c) (R1/R2)2
(d) (R1/R2)
Answer: C
Question: Choose the correct option
Assertion : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.
Reason : The average velocity of free electron is zero.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Answer: B
Question: A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 metre in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 metre in the same plane with the same B is
(a) 25 keV
(b) 50 keV
(c) 200 keV
(d) 100 keV
Answer: D
Question: According to oersted, around a current carrying conductor, magnetic field exists
(a) as long as there is current in the wire
(b) even after removing the current in the wire
(c) only few seconds after removing the current
(d) None of these
Answer: A
(b) II, III and IV
(d) I, III and IV
Answer: C
Answer: D
Answer: B
(b) Coulomb’s law
(d) Kirchhoff’s law
Answer: A
Answer: C
(b) cylindrical symmetry
(d) unsymmetrical
Answer: B
Answer: C
(b) Ampere’s coils
(d) Oersted’s coils.
Answer: C
Answer: B
(b) ni
(d) n2i
Answer: B
(b) compress
(d) None of these
(b) NABI2
(d) NABI
(b) magnetic field
(d) heat
(b) area ot the loop
(d) magnetic field
Answer: A
(b) II and III
(d) IV and I
(b) I and II
(d) III and IV
Question: In cyclotron the gyro radius is
Question: In cyclotron the resonance condition is
Question: A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is
(b) q B/v
(d) B v/q
Question: A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v. The radius of the circular path described by it will be
(b) mq / Bv
(d) mv / Bq
Question: Cyclotron is used to accelerate
(b) neutrons
(d) negative ions
Question: The magnetic dipole moment of a current loop is independent of
Question: Magnetic dipole moment of a rectangular loop is
Question: Consider the following statements and select the incorrect statement(s).
(b) II and III
(d) IV only
Question: The magnetic moment of a circular coil carrying current is
Question: To make the field radial in a moving coil galvanometer
Answer: C
Question: The deflection in a moving coil galvanometer is
Answer: B
(b) i ∝θ
(d) i ∝ θ
Question: A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10–2 Wb m–2 in 0.01 s. The e.m.f. induced in the coil is:
(a) 400 mV
(b) 200 mV
(c) 4 mV
(d) 0.4 mV
Answer: A
Question: A charged particle moves through a magnetic field perpendicular to its direction. Then
(a) kinetic energy changes but the momentum is constant
(b) the momentum changes but the kinetic energy is constant
(c) both momentum and kinetic energy of the particle are not constant
(d) both momentum and kinetic energy of the particle are constant
Answer: B
Question: A metallic rod of mass per unit length 0.5 kg m–1 is lying horizontally on a smooth inclined plane which makes an angle of 30°with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
(a) 7.14 A
(b) 5.98 A
(c) 11.32 A
(d) 14.76 A
Answer: C
Question: Choose the correct option
Assertion: The frequency of circular motion of a charged particle in cyclotron is independent of the mass of the particle.
Reason: Greater the mass of the particle less will be the frequency of the particle
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Answer: D
Question: A charged particle enters in a uniform magnetic field with a certain velocity. The power delivered to the particle by the magnetic field depends on
(a) force exerted by magnetic field and velocity of the particle.
(b) angular speed w and radius r of the circular path.
(c) angular speed w and acceleration of the particle.
(d) None of these
Answer: D
Question: The length of a solenoid is 0.4 m and the number turns in it is 500. A current of 3 amp, is flowing in it. In a small coil of radius 0.01 m and number of turns 10, a current of 0.4 amp. is flowing. The torque necessary to keep the axis of this coil perpendicular to the axis of solenoid will be
(a) 5.92 × 10–6 N-m
(b) 5.92 × 10–4 N-m
(c) 5.92 × 10–6 dyne-cm
(d) 5.92 × 10–4 dyne-cm
Answer: A
Question: The AC voltage across a resistance can be measured using a
(a) hot wire voltmeter
(b) moving coil galvanometer
(c) potential coil galvanometer
(d) moving magnet galvanometer
Answer: B
Question: The deflection in a moving coil galvanometer is
(a) directly proportional to the torsional constant
(b) directly proportional to the number of turns in the coil
(c) inversely proportional to the area of the coil
(d) inversely proportional to the current flowing
Answer: B
Question: The current sensitivity of a galvanometer is defined as
(a) the current flowing through the galvanometer when a unit voltage is applied across its terminals.
(b) current per unit deflection.
(c) deflection per unit current.
(d) dflection per unit current when a unit voltage is applied across its terminals
Answer: C
Question: A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be
(a) 0.001
(b) 0.01
(c) 1
(d) 0.05
Answer: A
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