(A) gets compressed
(B) gets expanded
(C) oscillates
(D) remains unchanged
Tag: Physics Mcq Questions and Answers
The magnetic field lines in the middle of a solenoid are:
(A) circles
(B) parallel to the axis
(C) spirals
(D) perpendicular to the axis
A straight wire of diameter 0.5 mm carrying a current of 1A is replaced by another wire of diameter 1 mm carrying same current. The strength of the magnetic field far away is:
(A) twice the earlier value
(B) half of the earlier value
(C) quarter of the earlier
(D) not changed
A magnetic field:
(A) always exerts a force on a charged particle
(B) never exerts a force on a charged particle
(C) exerts a force on a charged particle if it is moving along the magnetic lines of force
(D) exerts a force on a charged particle if it is moving along the magnetic lines of force
Lorentz force is given by:
(A) q(E + v x B)
(B) q(E – v x B)
(C) q(E + v . B)
(D) D) q(E x B x v)
A circular loop of area 0.01 m2 and carrying a current of 10A is parallel to a magnetic field of intensity 0.1 T. The torque acting on the loop, I Nm, is:
(A) zero
(B) 0.8
(C) 0.001
(D) 0.01
Magnetic effect of current was discovered by:
(A) Faraday
(B) Oersted
(C) Kirchhoff
(D) Joule
A strong magnetic field is applied on a stationary electron. Then the electron:
(A) moves in the direction of field
(B) moves opposite to the field
(C) starts spinning
(D) remains stationary