A square loop, carrying a steady current I, is placed in a horizo… - Vidyadip

MCQ

A square loop, carrying a steady current $I,$ is placed in a horizontal plane near a long straight conductor carrying a steady current $I_1$ at a distance $d$ from the conductor as shown in figure. The loop will experience

✓
a net attractive force towards the conductor
B
a net repulsive force away from the conductor
C
a net torque acting upward perpendicular to the horizontal plane
D
a net torque acting downward normal to the horizontal plane

✓

Answer

Correct option: A.

a net attractive force towards the conductor

a
$F_{2}=-F_{4}$

$F_{1}=\frac{\mu_{0} I_{1} \Pi}{2 \pi d l}$

$F_{2}=\frac{\mu_{0} I_{1} I}{2 \pi(d+l)}$

$F_{1}>F_{3}$

$F_{n e t}=F_{1}-F_{3}$

So, wire attract loop.

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 "M.C.Q (1 Marks)" from 4. Moving charges and magnetism→4. Moving charges and magnetism — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

In a building there are $15$ bulbs of $45\; \mathrm{W}, 15$ bulbs of $100\; \mathrm{W}, 15$ small fans of $10 \;\mathrm{W}$ and $2$ heaters of $1 \;\mathrm{kW}$. The voltage of electric main is $220\; \mathrm{V}$. The minimum fuse capacity (rated value) of the building will be: .......... $A$

$A$ battery of $\mathrm{emf}$ $E$ and internal resistance $r$ is connected across a resistance $R$. Resistance $R$ can be adjusted to any value greater than or equal to zero. Agraph is plotted between the current $(i)$ passing through the resistance and potential difference $(V) $ across it. Select the correct alternative $(s)$.

According to Joule's law, if potential difference across a conductor of material of resistivity remains constant, then heat produced in the conductor is directly proportional to

A light ray is incident, at an incident angle $\theta_{1}$, on the system of two plane mirrors $M_{1}$ and $M_{2}$ having an inclination angle $75^{\circ}$ between them (as shown in figure). After reflecting from mirror $M_{1}$ it gets reflected back by the mirror $M _{2}$ with an angle of reflection $30^{\circ}$. The total deviation of the ray will be $\dots$ degree.

Resistances $R_1$ and $R_2$ are joined in parallel and a current is passed so that the amount of heat liberated is $$ and $H_2$ respectively. The ratio $\frac{H_1}{H_2}$ has the value

In a radioactive reaction $92^{ X ^{232}} \rightarrow 82^{ Y ^{204}}$ , the number of α - particles emitted is

The energies stored in two capacitors of capacitances $C _1$ and $C _2$, are equal. The ratio of potential difference across capacitors will be :

The range of a projectile fired at an angle of 15° is 50m. If it is fired with the same speed at an angle of 45°, its range will be:

Two lenses are placed in contact with each other and the focal length of combination is $80 cm$. If the focal length of one is $20 cm,$ then the power of the other will be

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is