COMEDK · Physics · 21. Magnetic Effects of Current
Two very long straight parallel wires carry currents \(i\) and \(2 i\) in opposite directions. The distance between the wires is \(r\). At a certain instant of time a point charge \(q\) is at. a point equidistant from the two wires in the plane of the wires. Its instantaneous velocity \(v\) is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
- A \(\dfrac{\mu_0}{2 \pi} \dfrac{i q v}{r}\)
- B \(\dfrac{\mu_0}{\pi} \dfrac{i q v}{r}\)
- C zero
- D \(\dfrac{3 \mu_0}{2 \pi} \dfrac{i q v}{r}\)
Answer & Solution
Correct Answer
(C) zero
Step-by-step Solution
Detailed explanation
Let the two wires be placed along the \(y\)-axis at \(x = -r/2\) and \(x = r/2\). The wire at \(x = -r/2\) carries current \(i\) in the \(+y\) direction, and the wire at \(x = r/2\) carries current \(2i\) in the \(-y\) direction. The point charge \(q\) is at the origin…
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
- Point out the right statements about the validity of Kirchhoff's junction rule,COMEDK 2020 Easy
- The ratio of the radii of the nucleus of two element \(\mathrm{X}\) and \(\mathrm{Y}\) having the mass numbers 232 and 29 is:COMEDK 2024 Easy
- In Young's double slit experiment, if monochromatic light used is replaced by white light, thenCOMEDK 2013 Easy
- A body is projected vertically upwards. The times corresponding to height \(h\), while ascending and while descending are \(t_{1}\) and \(t_{2}\), respectively. Then, the velocity of projection is ( \(g\) is acceleration due to gravity)COMEDK 2020 Medium
- An electric dipole is placed at an angle of \(60^{\circ}\) with an electric field intensity \(10^4 \mathrm{~N} / \mathrm{C}\). If experiences a torque equal to \(4 \sqrt{3} \mathrm{~N}-\mathrm{m}\). The charge on the dipole, if the dipole length is 1 cm , isCOMEDK 2024 Medium
- In Young's double slit experiment light of wavelength \(500 \mathrm{~nm}\) is used to form interference pattern. A uniform glass plate of refractive index 1.5 and thickness \(0.1 \mathrm{~mm}\) is introduced in the path of one of the interfering beams. The number of fringes that will shift due to this isCOMEDK 2024 Medium
More PYQs from COMEDK
- In the expression \(\mathrm{P}=\mathrm{El}^2 \mathrm{~m}^{-5} \mathrm{G}^{-2}\) where \(\mathrm{E}, 1, \mathrm{~m}\) and G represent Energy, Angular Momentum, Mass and Gravitational Constant, the dimensions of P areCOMEDK 2025 Medium
- Let \(I_A\) and \(I_B\) be moments of inertia of a body about two axes \(A\) and \(B\), respectively. The axis \(A\) passes through the centre of mass of the body but \(B\) does not, then .COMEDK 2024 Easy
- At \(300 \mathrm{~K}\), the half-life period of a gaseous reaction at an initial pressure of \(40 \mathrm{kPa}\) is 350 s. When pressure is \(20 \mathrm{kPa}\), the half-life period is \(175 \mathrm{~s}\). What is the order of the reaction?COMEDK 2023 Medium
- Given the bond enthalpies of \(\mathrm{N} \equiv \mathrm{N}\) is \(946 \mathrm{~kJ} / \mathrm{mol}\). \(\mathrm{H}-\mathrm{H}\) is \(435 \mathrm{~kJ} / \mathrm{mol}, \mathrm{N}-\mathrm{N}\) is \(159 \mathrm{~kJ} / \mathrm{mol}\) and \(\mathrm{N}-\mathrm{H}\) is \(389 \mathrm{~kJ} / \mathrm{mol}\), heat of formation of hydrazine in the gas phase (in \(\mathrm{kJ} / \mathrm{mol}\)) isCOMEDK 2024 Hard
- If \(\cot ^{-1} \frac{1}{5}+\cot ^{-1} \frac{1}{3}-\cot ^{-1} \frac{4}{7}=\cot ^{-1} x\), then \(x\) is equal toCOMEDK 2014 Easy
- Match the following characteristics of transition metals given in Column I with the examples listed in Column II
S.No. Characteristic properties S.No. Examples W Chemically inert, non-stoichiometric compound A \(WO_3\) X Higher oxidation states are more stable B \(TiCl_4\) Y Due to inert pair effect, lower oxidation state is more stable C \(Mn_4N\) Z Colourless compound of transition metal D \(SnCl_2\) COMEDK 2023 Medium