iz'u 5% &eSXusV ds fyf¶Vax ikWoj d¨ le>kb, A

mÙkj 5% &eSXusV dh Dokby e— LV¨j ,utË ds cjkcj eSXusV dk fyf¶Vax ikWoj g¨rk gS A eSXusV e— LVksj ,utË eSXusV dh Dokby dh VuZ dh la[;k N] Dokby ds baMDV®l L v©j Dokby e— izokfgr g¨ jgs djaV ds eku I ij fuHkZj djrh gS A LV¨j ,utË Kkr djus dk lw= gS%

LV¨j ,utË

=

1/2  L I2

Since L

=

(N f) / I

f

=

¶yDl

LV¨j ,utË

=

1/2 {(N f)/I} I2

LV¨j ,utË

=

1/2NIf……joules

Since NI

=

HLn

H

=

Field strength

Ln

=

Length of magnetic field in meter

LV¨j ,utË

=

1/2(HLn) f

Since f

=

B A

B

=

Flux density.

A

=

Area of cross section of magnet in  m2

LV¨j ,utË

=

1/2(HLn)(BA)

Since Ln A

=

V=Volume of the magnetic field in m3

LV¨j ,utË

=

1/2HBV

LV¨j ,utË

=

1/2HB joules per cubic meter of field.

Since H

=

B / m0m r

m0

=

Absolute permeability.

m r

=

Relative permeability.

LV¨j ,utË

=

1/2 m0 m r H2   joules/m3

;k LV¨j ,utË

=

1/2 m0 m r {B2 / (m0mr)2}

LV¨j ,utË

=

1/2 B2 / m0mr=B2 / (2m0mr)   joules/m3

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