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THE STRAIGHT LINE

A straight line is the simplest geometric curve.

FORMS OF A STRAIGHT LINE

A STRAIGHT LINE PARALLEL TO THE AXES AT A GIVEN DISTANCE

The equation of a straight line parallel to the x-axis and at a distance a from it is
 

y = a

NOTE: By putting b = 0, […]

MAGNETIC FIELDS
DUE TO A STRAIGHT WIRE

As studied before the magnetic field due to a long current carrying wire is

B = ( m0i/4pd)(cosq1 - cosq2)

Now foe a long straight wire q1= 0 and q2= 180o, therefore the magnetic field is
 

B = m0i/2pd

SOLENOID

The magnetic field at any […]