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is electric current a scalar or a vector quantity?give reasons. 

Electric current is a scalar quantity.It represents the direction of flow of positive charge but it is treated as a scalar quantity because current follows the laws of scalar addition and not the laws of vector addition,because the angle between the wires carrying current does not effect the total current in the circuit.

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It is a scalar quantity. 

It has both direction and magnitude but it does not follow triangle law of addition in vectors.

Current added in any direction will always cause increase in current.

Hope it helps.

Thumbs up.. cheers

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