A coil is wound as a transformer of rectangular cross-section. If… - Vidyadip

MCQ

A coil is wound as a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor $2$ and the number of turns per unit length of the coil remain the same, the self inductance increased by a factor of

A
$16$
B
$12$
✓
$8$
D
$4$

✓

Answer

Correct option: C.

$8$

Self inductance $L=\mu_0 N^2 A / l=\mu_0 n^2 l A$ Where $n$ is the number of turns per unit length and $N$ is the total number of turns and $N=n l$ In the given question $n$ is same.
$A$ is increased $4$ times and $I$ is increased $2$ times and hence $L$ will be increased $8$ times.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Electromagnetic Induction→Electromagnetic Induction — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

In stationary wave

When we hear a sound, we can identify its source from

What is the resistance of a carbon resistance which has bands of colours brown, black and brown

Acceleration time graph of a body is shown. The corresponding velocity time graph of the same body is

When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts

Avalanche breakdown is due to

A block is lying on an inclined plane which makes $60^{\circ}$ with the horizontal. If coefficient of friction between block and plane is $0.25$ and $g=10 \mathrm{~m} / \mathrm{s}^2$, then acceleration of the block when it moves along the plane will be

In a stationary wave, all particles are

How many calories of heat will be produced approximately in a $210$ watt electric bulb in $5$ minutes

A machine which is $75$ percent efficient, uses $12$ joules of energy in lifting up a $1 \mathrm{~kg}$ mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in $m s^{-1}$ )