Question

Please answer the following questions
(i)On what principle does an electric motor work?
(a) Magnetic effect of electric current
(b) Electromagnetic induction
(c) Circular motion
(d) None of the above

(ii) When is the force on the rectangular coil the highest
(a) When current carrying conductor is aligned perpendicular to the external magnetic field
(b) When current carrying conductor is aligned parallel to the external magnetic field
(c) When the current is flowing clockwise in the circuit
(d) When the coil rotates anticlockwise

(iii) How do we find the direction of the force acting on the arms of the rectangular coil.
(a) By Flemings left hand rule
(b) By Flemings right hand rule
(c) Using clock rule
(d) By right hand thumb rule

(iv) Which out the following changes would make the rate of rotation of the coil faster?
(a) Decreasing the current
(b) Decreasing the cross sectional area of the coil
(c) Decreasing the number of loops in the coil
(d) Using an alloy as the material for making the coil​

Answer 1

Answer:

ans 1:magnetic effect of electric current