WBJEE · Physics · Magnetic Effects of Current
Current through \(\mathrm{ABC}\) and \(\mathrm{A}^{\prime} \mathrm{B}^{\prime} \mathrm{C}^{\prime}\) is \(\mathrm{I}\). What is the magnetic field at \(\mathrm{P}\) ? \(\mathrm{BP}=\mathrm{PB}^{\prime}=\mathrm{r}\left(\right.\) Here \(\mathrm{C}^{\prime} \mathrm{B}^{\prime} \mathrm{PBC}\) are collinear)
- A \(\mathrm{B}=\frac{1}{4 \pi} \frac{2 \mathrm{I}}{\mathrm{r}}\)
- B \(\mathrm{B}=\frac{\mu_0}{4 \pi}\left(\frac{2 \mathrm{I}}{\mathrm{r}}\right)\)
- C \(\mathrm{B}=\frac{\mu_{\mathrm{o}}}{4 \pi}\left(\frac{\mathrm{I}}{\mathrm{r}}\right)\)
- D Zero
Answer & Solution
Correct Answer
(B) \(\mathrm{B}=\frac{\mu_0}{4 \pi}\left(\frac{2 \mathrm{I}}{\mathrm{r}}\right)\)
Step-by-step Solution
Detailed explanation
Hints: \(\mathrm{B}=2\left[\frac{\mu_0}{4 \pi} \frac{I}{\mathrm{r}}\right]\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A radioactive nucleus of mass number A, initially at rest, emits an \(\alpha\)-particle with a speed \(v\). The recoil speed of the daughter nucleus will beWBJEE 2011 Medium
- The value of ' \(\lambda\) ' for which the two vectors \(\vec{a}=5 \hat{i}+\lambda \hat{j}+\hat{k}\) and \(\vec{b}=\hat{i}-2 \hat{j}+\hat{k}\) are perpendicular to each other isWBJEE 2010 Easy
- The work function of Cesium is \(2.27 \mathrm{eV}\). The cut-off voltage which stops the emission of electrons from a cesium cathode irradiated with light of \(600 \mathrm{nm}\) wavelength isWBJEE 2016 Medium
- A body of density \(1.2 \times 10^{3} \mathrm{~kg} / \mathrm{m}^{3}\) is dropped from rest from a height \(1 \mathrm{~m}\) into a liquid of density \(2.4 \times 10^{3} \mathrm{~kg} / \mathrm{m}^{3}\). Neglecting all dissipative effects, the maximum depth to which the body sinks before returning to float on the surface isWBJEE 2021 Medium
-
Consider the logic circuit with inputs A, B, C and output \(Y\). How many combinations of \(A, B\) and \(C\) gives the output \(Y=0\) ?WBJEE 2023 Easy - A cricket ball thrown across a field is at heights \(h_{1}\) and \(h_{2}\) from the point of projection at times \(t_{1}\) and \(t_{2}\) respectively after the throw. The ball is caught by a fielder at the same height as that of projection. The time of flight of the ball in this journey isWBJEE 2014 Hard
More PYQs from WBJEE
- The value of \(\frac{2}{3 !}+\frac{4}{5 !}+\frac{6}{7 !}+\ldots \ldots\). isWBJEE 2010 Hard
- If \(\mathrm{A}=\left[\begin{array}{rr}1 & 2 \\ -4 & -1\end{array}\right]\) then \(\mathrm{A}^{-1}\) isWBJEE 2010 Easy
- If \({ }^n C_4,{ }^n C_5\) and \({ }^n C_6\) are in A.P., then \(n\) isWBJEE 2011 Easy
- \[
\text { Dipole moment of }
\]
is \(1.5 \mathrm{D}\). The dipole moment of
isWBJEE 2010 Easy - Let \(f:[1,3] \rightarrow R\) be a continuous function that is differentiable in (1,3) an \(f^{\prime}(x)=|f(x)|^{2}+4\) for all \(x \in(1,3).\) Then,WBJEE 2019 Medium
- The well known compounds, \((+)-\) lactic acid and \((-)-\) lactic acid, have the same molecular formula, \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\). The correct relationship between them isWBJEE 2012 Medium