MCQ
For adjoining fig., The magnetic field at point, $P$ will be
- A$\frac{\mu_0}{4 \pi} \odot$
- B$\frac{\mu_0}{\pi} \otimes$
- C$\frac{\mu_0}{2 \pi} \odot$
- ✓$\frac{\mu_0}{2 \pi} \otimes$
✓
Answer
Correct option: D.
$\frac{\mu_0}{2 \pi} \otimes$
d
Magnetic field due to $5 A \rightarrow \frac{5 \mu_0}{2 \pi \times 2.5}=\frac{2 \mu_0}{2 \pi} \otimes$
Magnetic field due to $5 A \rightarrow \frac{5 \mu_0}{2 \pi \times 2.5}=\frac{2 \mu_0}{2 \pi} \otimes$
Magnetic field due to $2.5 A \rightarrow \frac{2.5 \mu_0}{2 \pi \times 2.5}=\frac{\mu_0}{2 \pi} \odot$
Resultant Magnetic field $B_{net}=\frac{2 \mu_0}{2 \pi}-\frac{\mu_0}{2 \pi}=\frac{\mu_0}{2 \pi} \otimes$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Two objects $A$ and $B$ each of mass $m$ are connected by a light inextensible string. They are restricted to move on a frictionless ring of radius $R$ in a vertical plane (as shown in fig). The objects are released from rest at the position shown. Then, the tension in the cord just after release is
→A particle moves from a point $\left( { - 2\hat i + 5\hat j} \right)$ to $\left( {4\hat i + 3\hat j} \right)$ when a force of $\left( {4\hat j + 3\hat k} \right)$ is applied. How much work has been done by the force ? $......J$
→A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle
→Which one of the following phenomena is not explained by Huygen's construction of wavefront
The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which is correct
→Water of mass $m$ gram is slowly heated to increase the temperature from $T_1$ to $T_2$. The change in entropy of the water, given specific heat of water is $1 Jkg ^{-1} K^{-1}$, is :
→The image of an extented object, placed perpendicular to the principal axis of a mirror, will be erect if
Two magnets $A$ and $B $ are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of $B$ is twice the time period of $A$. The ratio of the magnetic moments ${M_A}/{M_B}$ of the magnets will be
→Figure shows a thick shell made of electrical conductivity $\sigma$ and has inner & outer radii of $10\ cm$ & $20\ cm$ respectively and is filled with ice inside it. Its inside and outside surface are kept at different potentials by a battery of internal resistance $\frac{2}{\pi} \Omega \ \&\ \epsilon = 5V$. Find value of $\sigma$ for which ice melts at maximum possible rate if $25\%$ of heat generated by shell due to joule heating is used to melt ice.
→Calculate the focal length of given lens if the magnification is $-0.5$ (in $cm$)
→