JEE Mains · Physics · STD 12 - 4. Moving charges and magnetism
An electron is allowed to move with constant velocity along the axis of current carrying straight solenoid. \(A.\) The electron will experience magnetic force along the axis of the solenoid. \(B.\) The electron will not experience magnetic force. \(C.\) The electron will continue to move along the axis of the solenoid. \(D.\) The electron will be accelerated along the axis of the solenoid. \(E.\) The electron will follow parabolic path-inside the solenoid. Choose the correct answer from the options given below:
- A \(B, C\) and \(D\) only
- B \(B\) and \(C\) only
- C \(A\) and \(D\) only
- D \(B\) and \(E\) only
Answer & Solution
Correct Answer
(B) \(B\) and \(C\) only
Step-by-step Solution
Detailed explanation
\(\overrightarrow{ F }= q (\overrightarrow{ v } \times \overrightarrow{ B })\) as angle between \(\overrightarrow{ v }\) and \(\overrightarrow{ B }\) is \(0^{\circ}\) \(\overrightarrow{ F }=0\)
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 vessel contains \(14\,g\) of nitrogen gas at a temperature of \(27^{\circ}\,C\). The amount of heat to be transferred to the gap to double the r.m.s. speed of its molecules will be \(......J\) \(\left(\right.\) Take \(R =8.32\,J\,mol ^{-1} k ^{-1}\) )JEE Mains 2022 Medium
- Given below are two statements: one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\) Assertion \(A:\) Diffusion current in a \(p-n\) junction is greater than the drift current in magnitude if the junction is forward biased. Reason \(R:\) Diffusion current in a \(p-n\) junction is from the \(n\)-side to the \(p\)-side if the junction is forward biased. In the light of the above statements, choose the most appropriate answer from the options given belowJEE Mains 2023 Medium
- An object of uniform density rolls up the curved path with the initial velocity \(v_0\) as shown in the figure. If the maximum height attained by an object is \(\dfrac{7v_0^2}{10g}\) (\(g\) = acceleration due to gravity), the object is a _______.
JEE Mains 2026 Medium - Consider following statements:
A. Surface tension arises due to extra energy of the molecules at the interior as compared to the molecules at the surface, of a liquid.
B. As the temperature of liquid rises, the coefficient of viscosity increases.
C. As the temperature of gas increases, the coefficient of viscosity increases
D. The onset of turbulence is determined by Reynold's number.
E. In a steady flow two stream lines never intersect.
Choose the correct answer from the options given below:JEE Mains 2025 Medium - To project a body of mass \(m\) from earth's surface to infinity, the required kinetic energy is _______. (assume, the radius of earth is \(R_E, g=\) acceleration due to gravity on the surface of earth)JEE Mains 2024 Hard
- Two identical spherical balls of mass \(M\) and radius \(R\) each are stuck on two ends of a rod of length \(2R\) and mass \(M\) (see figure). The moment of inertia of the system about the axis passing perpendicularly through the centre of the rod is
JEE Mains 2019 Hard
More PYQs from JEE Mains
- If \(2\) and \(6\) are the roots of the equation \(a x^2+b x+1=0\), then the quadratic equation, whose roots are \(\frac{1}{2 a+b}\) and \(\frac{1}{6 a+b}\), is :JEE Mains 2024 Medium
- If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is _________ m.
(Atomic number of gold \(=79\) and \(\frac{1}{4 \pi \epsilon_0}=9 \times 10^9\)in SI units)JEE Mains 2026 Hard - If the term independent of \(x\) in the exapansion of \(\left(\frac{3}{2} x^{2}-\frac{1}{3 x}\right)^{9}\) is \(k,\) then \(18 k\) is equal toJEE Mains 2020 Medium
- Let \(S\) be the set of all \(\lambda \in \mathrm{R}\) for which the system of linear equations \(2 x-y+2 z=2\) \(x-2 y+\lambda z=-4\) \(x+\lambda y+z=4\) has no solution. Then the set \(S\)JEE Mains 2020 Medium
- A short straight object of height \(100\, cm\) lies before the central axis of a spherical mirror whose focal length has absolute value \(| f |=40\, cm .\) The image of object produced by the mirror is of height \(25\, cm\) and has the same orientation of the object. One may conclude from the informationJEE Mains 2021 Hard
- The line of intersection of the planes \(\vec r.\left( {3\hat i - \hat j + \hat k} \right) = 1\) and \(\vec r.\left( {\hat i + 4\hat j - 2\hat k} \right) = 2\), isJEE Mains 2017 Hard