What is the difference between direct current generator and alternating current generator? ( CBSE 2014)

Why and when does a current carrying conductor kept in a magnetic field experience force ? list the factors responsible on which the direction of this force depends? ( CBSE 2008)

How will the magnetic field produced at a point P by a current carrying-circular coil change if we increase the

i. value of current flowing through the coil,

ii. distance of the point P from the coil,

iii. number of turns of the coil?  (CBSE  2009)

A) What is meant by “magnetic filed”?

B) How is the direction of magnetic field lines at appoint determined?

C) Describe an activity to demonstrate the direction of the magnetic field generated arounda current carrying conductor.

Write the principle of the electric motor. Explain the construction and working of the motor. Draw labeled diagram. ( CBSE 2016, 2014)