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(1) directly proportional to (a) the strength of the current i,

(b) length of the element dl (c) sine of the angle θ between the element in the direction of current and the line joining the element to the point P.

i.e., dB∝i,dB∝δ,dB∝sinθ

(2) inversely proportional to the square of the distance r of the point P from the centre of the element.

dB=μ04π×Idlsinθr2

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