Question

A large number of infinite long thin wires each carrying current $i_o$ are kept along z-axis. Then the value of magnetic field 'B' at any point 'P' at a distance 'x' from O varies as

• A. $B\propto x$
• B. $B\propto \frac{1}{x}$
• C. $Bisindependentofx$
• D. $B\propto \frac{1}{x^2}$

Answer 1

The correct option is B $B\propto \frac{1}{x}$

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