COMEDK · Physics · 21. Magnetic Effects of Current
An electron is moving along positive \(X\)-axis. To get it moving on an anti-clockwise circular path in \(X-Y\)-plane, a magnetic field is applied
- A along positive \(Y\)-axis
- B along positive \(Z\)-axis
- C along negative \(Y\)-axis
- D along negative \(Z\)-axis
Answer & Solution
Correct Answer
(B) along positive \(Z\)-axis
Step-by-step Solution
Detailed explanation
For the particle to move along anti-clockwise path, force should be along \(\hat{\mathbf{j}} y\)-direction. Since, velocity is along \(\hat{\mathbf{i}}\), Hence, \(F_m=-e(\mathbf{v} \times \mathbf{B})\) In terms of unit vectors,…
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
- What is the maximum wave length of EM radiation required to move an electron from the valance band to conduction band of a semiconductor? [Given :Energy gap \(\mathrm{E}_{\mathrm{g}}=1.98 \times 10^{-19} \mathrm{~J}\); Planck's constant \(h=6.6 \times 10^{-34} \mathrm{Js}\) ]COMEDK 2025 Medium
- The current in a coil changes steadily from \(3 \mathrm{~A}\) to \(5 \mathrm{~A}\) in \(0.2 \mathrm{~s}\) when an emf of \(2 \mu \mathrm{V}\) is induced in it. The self-inductance of the coil isCOMEDK 2024 Easy
- For CE transistor amplifier, the audio signal voltage across the collector resistance of \(4 \mathrm{l} \Omega\) is \(5 \mathrm{~V}\). If the current amplification factor of the transistor is 100 and base resistance is \(2 \mathrm{k} \Omega\), then input signal voltage isCOMEDK 2022 Hard
- The carrier of electromagnetic interaction isCOMEDK 2012 Easy
- Which of the following graph shows the variation of velocity with mass for the constant momentum?
COMEDK 2024 Easy - A gas is taken through the cycle \(A \rightarrow B \rightarrow C \rightarrow A\), as shown in figure. What is the net work done by the gas?
COMEDK 2023 Medium
More PYQs from COMEDK
- If the straight lines \(\dfrac{x-2}{1}=\dfrac{y-3}{1}=\dfrac{z-4}{-t}\) and \(\dfrac{x-1}{t}=\dfrac{y-4}{2}=\dfrac{z-5}{1}\) are intersecting then \(t\) can haveCOMEDK 2024 Medium
- \(\mathrm{H-}\)polaroid is prepared byCOMEDK 2013 Medium
- Which one of the following statements is correct?COMEDK 2023 Medium
- The value of \(\int_{-2}^{2}\left(a x^{3}+b x+c\right) d x\) depends on theCOMEDK 2019 Hard
- If \(A=\left[\begin{array}{ccc}0 & x & 16 \\ x & 5 & 7 \\ 0 & 9 & x\end{array}\right]\) is a singular matrix then \(x\) is equal toCOMEDK 2024 Medium
- Detergents can be made biodegradable and pollution free byCOMEDK 2015 Easy