Physics · 2020
JEE Main · 9 January 2020, Shift 2 · Q14
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/ length and carries a current I. The electron gun…
An electron gun is placed inside a long solenoid of radius $\displaystyle R$ on its axis. The solenoid has n turns/ length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed $\displaystyle v$. If the electron does not hit the surface of the solenoid, maximum possible value of $\displaystyle v$ is (all symbols have their standard meaning) :
Official answer
(2)
$\displaystyle \frac{\mathrm{e} \mu_0 \mathrm{n} \mathrm{IR}}{2 \mathrm{~m}}$
More from Magnetic Field and Forces
- A student is provided with a variable voltage source V, a test resistor R_T=10 Ω, two identical galvanometers G_1 and G_2 and two additional…2023
- An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then:2024
- Given below are two statements: Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity…2023
- For a moving coil galvanometer, the deflection in the coil is 0.05 rad when a current of 10 mA is passed through it. If the torsional constant of…2023
- An electron moves through a uniform magnetic field B=B_0 i+2 B_0 j T. At a particular instant of time, the velocity of electron is u=3 i+5 j m / s.…2024
- A uniform magnetic field of 2 × 10^-3 T acts along positive Y -direction. A rectangular loop of sides 20 cm and 10 cm with current of 5 A is in Y-Z…2024
- An infinitely long straight wire carrying current I is bent in a planer shape as shown in the diagram. The radius of the circular part is r. The…2026
- A wire of length 8 m is bent to form a circular loop in y-z plane. A current of 0.5 A is flowing in anticlockwise direction in it, the magnetic…2022
JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.