Goyal Brothers Prakashan Class 8 Physics Solutions. We covered all the Goyal Brothers Prakashan Class 8 Physics Solutions in this post for free so that you can practice well for the exam.
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Goyal Brothers Prakashan Class 8 Physics MCQs for Students
A straight wire of length 0.5m and carrying a current of 1.2A is placed in a uniform magnetic field of induction 2T. The magnetic field is perpendicular to the length of the wire. The force on the wire is :
(A) 1.2 N
(B) 2 N
(C) 2.4 N
(D) 3 N
Option a – 1.2 N
A charge moving with velocity v in the X-direction is subjected to a field of magnetic induction in the negative X-direction. As a result, the charge will
(A) Remain unaffected
(B) Start moving in a circular path in the Y-Z plane
(C) Retard along X-axis
(D) Move in a helical path around X-axis
Option a – Remain unaffected
A magnetic field exerts no force on
(A) a Stream of electrons
(B) a Stream of a proton
(C) an Unmagnetised piece of iron
(D) a Stationary charge
Option d – a Stationary charge
The cyclotron frequency of an electron revolving in a magnetic field of 1 T is approximate:
(A) 28 MHz
(B) 2.8 GHz
(C) 280 MHz
(D) 28 GHz
Option d – 28 GHz
An electron is traveling along the x – direction. It encounters a magnetic field in the y direction. Its subsequent motion will be
(A) a Straight line along the x-direction
(B) A circle in the xz plane
(C) A circle in the yz plane
(D) A circle in the xy plane
Option b – A circle in the xz plane
A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle with being
(A) A straight line
(B) A circle
(C) A helix with a uniform pitch
(D) A helix with a non-uniform pitch
Option c – A helix with a uniform pitch
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