CBSE Class 12 Moving Charges and Magnetism Multiple Choice Questions with Answers. MCQ Questions Class 12 Moving Charges and Magnetism with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Moving Charges and Magnetism MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Moving Charges and Magnetism with Answers - Set - 5
Question 1:
A long straight wire carries a certain current and produces a magnetic field 2 × 10–4 Wb m–2 at a perpendicular distance of 5 cm from the wire.
An electron situated at 5 cm from the wire moves with a velocity 107 m/s towards the wire along perpendicular to it. The force experienced by the
electron will be (charge on electron 1.6 × 10–19 C)
(a) 3.2 N
(b) 3.2 × 10–16 N
(c) 1.6 × 10–16 N
(d) zero
Correct Answer – (B)
Question 2 :
The radius of the trajectory of a charged particle in a uniform magnetic field is proportional to the:
(a) charge on the particle
(b) energy of the particle
(c) momentum of the particle
(d) all the above
Correct Answer – (C)
Question 3 :
10 eV electron is circulating in a plane at right angle to a uniform field of magnetic induction 10-1 Wb/m² (1G). The orbital radius of electron is:
(a) 12 cm
(b) 16 cm
(c) 11 cm
(d) 18 cm
Correct Answer – (C)
Question 4 :
According to Gauss’s theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always:
(a) -1
(b) 1
(c) 0
(d) infinity
Correct Answer – (C)
Question 5 :
The SI unit of magnetic dipole moment is’
(a) Ampere
(b) Ampere metre²
(c) Tesla
(d) None of these
Correct Answer – (B)
MCQ Questions Class 12 Moving Charges and Magnetism with Answers
Question 6 :
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) 14.76 A
(d) 11.32 A
Correct Answer – (D)
Question 7 :
A cyclotron can be used to produce high energy:
(a) neutrons
(b) deutrons
(c) β particles
(d) α partifcles
Correct Answer – (D)
Question 8 :
Tesla is a unit of:
(a) electric flux
(b) magnetic flux
(c) magnetic field
(d) electric field
Correct Answer – (C)
Question 9 :
Earth’s magnetism was discovered by:
(a) Gauss
(b) Oersted
(c) Ampere
(d) Gilbert
Correct Answer – (D)
Question 10 :
The most suitable metal for making permanent magnets is :
(a) iron
(b) steel
(c) copper
(d) aluminium
Correct Answer – (B)
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