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Consider a wire carrying an electric current I and also consider an infinitely small length of a wire dl at a distance r from point A.

Biot Savart Law states that magnetic intensity dB at a point A due to current I flowing through a small element dl is

a) Directly proportional to current (I)

b) Directly proportional to the length of the element (dl)

c) Directly proportional to the sine of angle θ between the direction of current and the line joining the element dl from point A.

d) Inversely proportional to the square of the distance (x) of point A from the element dl.

dB∝Idlsinθr2

dB=KIdlsinθr2

where, K=μ0μr4π

μ0= Absolute permittivity of air in vacuum

μr= relative permittivity.

a) Directly proportional to current (I)

b) Directly proportional to the length of the element (dl)

c) Directly proportional to the sine of angle θ between the direction of current and the line joining the element dl from point A.

d) Inversely proportional to the square of the distance (x) of point A from the element dl.

dB∝Idlsinθr2

dB=KIdlsinθr2

where, K=μ0μr4π

μ0= Absolute permittivity of air in vacuum

μr= relative permittivity.

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