Consider a long straight wire of a circular cross-section (radius a) carrying a steady current I. The current…

Question

Consider a long straight wire of a circular cross-section (radius $a$ ) carrying a steady current $I$ . The current is uniformly distributed across this cross-section. The distances from the centre of the wire's cross-section at which the magnetic field (inside the wire, outside the wire) is half of the maximum possible magnetic field, anywhere due to the wire, will be:

A
$\left[ \frac{a}{2}, 3a \right]$
B
$\left[ \frac{a}{2}, 2a \right]$
C
$\left[ \frac{a}{4}, 2a \right]$
D
$\left[ \frac{a}{4}, \frac{3a}{2} \right]$

Accepted Answer

B. $$\left[ \frac{a}{2}, 2a \right]$$

Answer

A. $$\left[ \frac{a}{2}, 3a \right]$$

Answer

C. $$\left[ \frac{a}{4}, 2a \right]$$

Answer

D. $$\left[ \frac{a}{4}, \frac{3a}{2} \right]$$

Answer & step-by-step solution

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