Question

Match the column $I$ with column $II$.

Column $I$	Column $II$
$a.$ 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

• A. $a-r;b-p;c-q,r;d-s$
• B. $a-r;b-p;c-q;d-s$
• C. $a-r;b-p;c-r;d-s$
• D. $a-r;b-p;c-s;d-s$

Answer 1

The correct option is A $a-r;b-p;c-q,r;d-s$

$a.$ Magnetic field inside a long straight solenoid is constant as $B={\mu }_{0}nI=$constant.

$\Rightarrow a\to r$

$b.$ Magnetic field inside a toroidal solenoid is not constant as magnitude is constant but direction changes at each point.

$B=\frac{{\mu }_{0}NI}{2\pi r}=$ constant


$\Rightarrow b\to p$

$c.$ Magnetic field inside a conducting hollow pipe having current parallel to its axis is zero and constant.

$\Rightarrow c\to q,r$

$d.$ Magnetic field due to current carrying wire on its surface is maximum.

$\Rightarrow d\to s$