magnetic effect of current

MAGNETIC EFFECT OF CURRENT

·       Magnetic Effect of Current

·       Right Hand Thumb Rule

·       Maxwell’s Cork Screw Rule

·       Biot –Savart’s Law

Right Hand Thumb Rule:

If a current carrying conductor is to be hold in the right hand then the thumb points in the direction of the current, and tips of the fingers encircling the conductor will give the direction of the magnetic lines of force.

Maxwell’s Cork Screw Rule:

If motion of an imaginary right handed screw is in the direction of the current through a linear conductor, the direction of rotation of the screw gives the direction of the

magnetic lines of force around the conductor.

Biot – Savart’s Law:

The strength of magnetic field dB due to a small current carrying element dl carries a current I at a point P distant r from current element is directly proportional to I (length of the wire), dl(value of small element length at which magnetic field is calculated), sin θ and inverselyproportional to the square of the distance (r2) where θ is the angle between dl and r.

small magnetic field at dl is given by

dB α I

 dB α dl

 dB α sin θ

 dB α 1 / r2

dB αI dl sin θ/r2

dB =μ0  / 4π ( I dl sin θ /r2 )

Value of μ0 = 4π x 10-7 Tm A-1 .

Continue reading with:

• Guass theorem
• Photoelectric effect
• Compton effect
• Semiconductor
• Electrostatics (physics class 12)
• transformer
• Solid state (chemistry class 12)
• Electromagnetic induction

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