Question

With neat labelled diagram derive the equation for transformer. * State Ampere's circuital law.​

Answer 1

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Ampere's circuital law states that line integral of magnetic field around any closed loop is equal to μ times the electric current flowing through the cross-section area enclosed by that loop.

Mathematically,

$∮B.dl=μI$

Let the current flowing in the solenoid having number of turns per unit length n be I.

• Magnitude of magnetic field inside the solenoid is B while at outside is zero.
• The second and fourth term are zero because angle between magnetic field and the length loop is 90°
• The third term is also zero as the value of magnetic field outside the solenoid is zero.Total current flowing through the loop.

Answer 2

Ampere's circuital law states that “the line integral of the magnetic field surrounding closed-loop equals to the number of times the algebraic sum of currents passing through the loop.”