An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y-direction. Which of the following physical quantity(ies) is (are) non zero and remain constant ?
I. Velocity of the electron
II. Magnitude of the momentum of the electron.
III. Force On the electron.
IV. The kinetic energy of electron.

Only I and II.

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Only III and IV.

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All four

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Only II and IV.

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Solution

The correct option is D Only II and IV.
Velocity and force change due to change in direction but magnitude of P and KE of electron remain constant speed is constant.

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Similar questions

Q. An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the followed physical quantity(ies) is (are) non-zero and remain constant?
I. Velocity of the electron.
II Magnitude of the momentum of the election.
III. Force on the electron.
IV. The kinetic energy of electron.

An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following physical quantity (ies) is (are) non-zero and remain constant?

A charged particle (electron or proton) is introduced at the origin $(x = 0, y = 0, x = 0)$ with a given initial velocity $\to v$ . A uniform electric field $\to E$ and a uniform magnetic field $\to B$ exist everywhere. The velocity $\to v$ , electric field $\to E$ and magnetic field $\to B$ are given in column $1, 2$ and $3,$ respectively. The quantities $E_{0}, B_{0}$ are positive in magnitude.

Column 1	Column 2	Column 3
(I) Electron with $\to v = 2 \frac{E_{0}}{B_{0}}^x$	(i) $\to E = E_{0}^z$	(P) $\to B = - B_{0}^x$
(II) Electron with $\to v = \frac{E_{0}}{B_{0}}^y$	(ii) $\to E = - E_{0}^y$	(Q) $\to B = - B_{0}^x$
(III) Electron with $\to v = 0$	(iii) $\to E = - E_{0}^x$	(R) $\to B = B_{0}^y$
(IV) Electron with $\to v = 2 \frac{E_{0}}{B_{0}}^x$	(iv) $\to E = E_{0}^x$	(S) $\to B = B_{0}^z$

In which case would the particle move in a straight line along the negative direction of

y

-axis (i.e, move along

-^y) ?

Q. A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron

Q. A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with velocity pointed in the same direction the electron will

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The correct option is D Only II and IV.Velocity and force change due to change in direction but magnitude of P and KE of electron remain constant speed is constant.

The correct option is D Only II and IV.
Velocity and force change due to change in direction but magnitude of P and KE of electron remain constant speed is constant.