Question

when constant current flow in the primary of transformer the. wmf induced in the secondary is?
regular
irregular
zero
alternating​

Answer 1

Answer:

In a transformer, source of alternating current is applied to the primary coil. Due to this, the current in the primary coil (called as magnetizing current) produces alternating flux in the core of transformer. This alternating flux gets linked with the secondary coil, and because of the phenomenon of mutual induction an emf gets induced in the secondary coil.

Mutual induction:

An alternating current flowing in a coil produces alternating magnetic field around it. When two or more coils are magnetically linked to each other, then an alternating current flowing through one coil causes an induced emf across the other linked coils. This phenomenon is called as mutual induction.

From these principles, it can be derived that emf divided by number of turns is same for both primary and secondary winding.

That is,

N1/E1 = N2/E2

where,

E1 is the induced EMF in the primary coil

E2 is the induced EMF in the secondary coil

N1 is the number of turns in the primary coil

N2 is the number of turns in the secondary coil

Answer 2

Answer:

The correct option is alternating.

Explanation:

• The primary coil of a transformer receives an alternating current source.
• As a result, the primary coil's current, also known as the magnetising current, produces an alternating flux in the transformer's core.
• Due to the mutual induction phenomenon, this alternating flux is connected to the secondary coil and induces an emf in it.
• Unlike direct current, which only flows in one direction, alternating current regularly changes direction and continuously modifies its amplitude over time.
• A transformer is a tool used to move electrical energy from one alternating-current circuit to one or more additional circuits, either by stepping up the voltage or stepping down the voltage.

The EMF induced is alternating.

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