<p>Which factors don't affect motional EMF?</p>

Motional EMF is a condition which arises due to the movement of conductor in a magnetic field. On the other hand, induced EMF is a cause of change in the magnetic fiedl over a certain timespan. Induced EMF arises when there is a change in the magnetic flux.

What is the major cause of Motional EMF? Electric field or Magnetic field?

Aadit Singh Uppal

The movement of the body in the conductor is caused by the magnetic field. This magnetic field then causes an electric current to flow in the system. Hence, the direct action is caused by the magnetic force on the object, due to which it becomes the major source of motional EMF.

According to Lenz’s law of electromagnetic induction

alok kumar singh

The direction of induced emf is to oppose changing flux.

The horizontal component of earth’s magnetic field at a place is 4 × 10^–4 T and dip is 45°. A metal rod of length 20 cm is placed in north south direction and is moved at constant speed of 5 cm/s towards East. What is e.m.f. induced in the rod?

alok kumar singh

Three long wires, carrying current 10 A, 20 A and 30 A are placed parallel to each other as shown. Point P and Q are in midway of wires. What is ratio of magnetic field at P to the Q?