How is the magnetic field due to a long straight wire carrying a current $I$ vary with current?

\propto I

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\propto I^{2}

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\propto I^{3}

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\propto \sqrt{I}

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Solution

The correct option is A $\propto I$
A field due to a long straight wire carrying current I is proportional to $I (B = \frac{μ_{0} I}{2 π r})$

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A circular loop of radius r carries a current i. How should a long, straight wire carrying a current, 4i be placed in the plane of the circle so that the magnetic field at the centre becomes zero ?

Q. Match the column

I

with column

I I

Column $I$	Column $I I$
$a .$ Magnetic field inside a long straight solenoid is	$p .$ not constant
$b .$ Magnetic field inside a toroidal solenoid is	$q .$ zero
$c .$ Magnetic field inside a conducting hollow pipe having current parallel to its axis is	$r .$ constant
$d .$ Magnetic field due to current carrying wire on its surface is	$s .$ maximum

How is the magnetic field due to a straight current carrying wire affected if current in the wire is (a) decreased, (b) reversed?

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How is the magnetic field due to a long straight wire carrying a current I vary with current?

The correct option is A ∝IA field due to a long straight wire carrying current I is proportional to I(B=μ0I2πr)

How is the magnetic field due to a long straight wire carrying a current $I$ vary with current?

The correct option is A $\propto I$
A field due to a long straight wire carrying current I is proportional to $I (B = \frac{μ_{0} I}{2 π r})$