Two equal electric currents are flowing perpendicular to each other as shown in the figure.
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The charge acquired by a glass rod when rubbed with silk is
called positive charge and the charge acquired by an ebonite rod when rubbed with wool is called negative charge.
2.�� Coulomb: It is the S.I. unit of charge. One coulomb is defined as that amount of charge which repels an equal and similar charge with a force of 9 x 109 N when placed in vacuum at a distance of 1 meter from it.
Charge on an electron = -1.6 x 10-19 coulomb.
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