(A) 1T = 103 G (X)
(B) 1T = 10-4 G (X)
(C) 1T = 10-2 G (X)
(D) 1T = 104 G ()

Answers: The relationship between Tesla and smaller unit Gauss of magnetic induction is given by 1T=104 G.

(A) air (X)
(B) steel (X)
(C) Cu-Ni alloy (X)
(D) soft iron ()

Answers: Which one of the following material is most suitable for making core of a an electromagnet soft iron .

(A) always exerts a force on a charged particle (X)
(B) never exerts a force on a charged particles (X)
(C) exerts a force if the charged particle is moving in the direction of the magnetic field lines (X)
(D) exerts a force if the charged particle is moving perpendicular to the magnetic field lines ()

Answers: A magnetic field  exerts a force if the charged particle is moving perpendicular to the magnetic field  lines.

(A) repel each other ()
(B) attract each other (X)
(C) have no effect upon each other (X)
(D) they cancel out their individual magnetic fields (X)

Answers:  Two parallel wire carrying current in the opposite directions repel each other .

(A) 1A (X)
(B) 10A (X)
(C) 100A ()
(D) 1000A (X)

Answers: What is the of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5  weber/m2 when the force acting on the wire is 5N 100A.

(A) magnetic flux (X)
(B) magnetic field intensity (X)
(C) magnetic induction ()
(D) self inductance (X)

Answers: Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with  a unit velocity is called magnetic induction.