KCET · Physics · Magnetic Effects of Current
Two thin long parallel wires separated by a distance ' \(r\) ' from each other in vacuum carry a current of I ampere in opposite directions. Then, they will
- A Attract each other with a force per unit length of \(\frac{\mu_0 I^2}{2 \pi r}\)
- B Repel each other with a force per unit length of \(\frac{\mu_0 I^2}{2 \pi r}\)
- C Repel each other with a force per unit length of \(\frac{\mu_0 I^2}{2 \pi r^2}\)
- D Attract each other with a force per unit length of \(\frac{\mu_0 I^2}{2 \pi r^2}\)
Answer & Solution
Correct Answer
(B) Repel each other with a force per unit length of \(\frac{\mu_0 I^2}{2 \pi r}\)
Step-by-step Solution
Detailed explanation
\(\frac{\mathrm{f}}{\ell}=\frac{\mu_0 \mathrm{i}, \mathrm{i}_2}{\mathrm{t} \pi \mathrm{r}}\)
If they carry opposite currently they repeat each other
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
- According to Huygens' principle, during refraction of light from air to a denser mediumKCET 2017 Easy
- Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged, if the density of ice is \(\rho_{i}=0.917 \mathrm{~g} \mathrm{~cm}^{-3}\) ?KCET 2020 Medium
- A \(220 \mathrm{~V}\) AC supply is connected between points \(A\) and \(B\) as shown in figure, what will be the potential difference \(V\) across the capacitor?
KCET 2020 Easy - The equation of a wave is given by \(y=10 \sin \left(\frac{2 \pi}{45} t+\alpha\right)\). If the displacement is \(5 \mathrm{~cm}\) at \(t=0\), then the total phase at \(t=7.5 \mathrm{~s}\) isKCET 2011 Easy
- A positively charged glass rod is brought near uncharged metal sphere, which is mounted on an insulated stand. If the glass rod is removed, the net charge on the metal sphere isKCET 2023 Easy
- From the following graph of photo current against collector plate potential, for two different intensities of light \( I_{1} \) and \( I_{2} \), one can conclude
KCET 2017 Hard
More PYQs from KCET
- The standard electrode potential for the half-cell reactions are
\[
\begin{aligned}
&\mathrm{Zn}^{2+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn} ; \mathrm{E}^{\circ}=-0.76 \mathrm{~V} \\
&\mathrm{Fe}^{2+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Fe} ; \mathrm{E}^{\circ}=-0.44 \mathrm{~V}
\end{aligned}
\]
The emf of the cell reaction,
\(\mathrm{Fe}^{2+}+\mathrm{Zn} \longrightarrow \mathrm{Zn}^{2+}+\mathrm{Fe}\) isKCET 2009 Easy - The variety of indigenous cows is an example forKCET 2017 Easy
- The working of magnetic braking of trains is based onKCET 2017 Medium
- Two similar galvanometers are covered into an ammeter and a milliammeter. The shunt resistance of ammeter as compared to the shunt resistance of milliammeter will beKCET 2025 Medium
- If \(y=(x-1)^{2}(x-2)^{3}(x-3)^{5}\), then \(\frac{d y}{d x}\) at \(x=4\) is equal toKCET 2021 Medium
- Consider the following statements Statement 1 : If \(y=\log _{10} x+\log _{c} x\), then \(\frac{d y}{d x}=\frac{\log _{10} e}{x}+\frac{1}{x}\)
Statement 2 : If \(\frac{d}{d x}\left(\log _{10} x\right)=\frac{\log x}{\log 10}\) and \(\frac{d}{d x}\left(\log _{e} x\right)=\frac{\log x}{\log e}\)KCET 2021 Medium