SATHEE: Magnetics 1 Question 24

Magnetics 1 Question 24

24. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $E$ and $B$ represent the electric and magnetic fields respectively. Then, this region of space may have

$(1985, 2 M)$

(a) $E = 0, B = 0$

(b) $E = 0, B \neq 0$

(d) $E \neq 0, B \neq 0$

Match the Columns

Directions (Q.Nos. 25-27) Matching the information given in the three columns of the following table.

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

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

(2017 Adv.)

Show Answer

Answer:

Correct Answer: 24. $(a, b, d)$

Solution:

If both $E$ and $B$ are zero, then $F_{e}$ and $F_{m}$ both are zero. Hence, velocity may remain constant. Therefore, option (a) is correct.

If $E = 0, B \neq 0$ but velocity is parallel or antiparallel to magnetic field, then also $F_{e}$ and $F_{m}$ both are zero. Hence, option (b) is also correct.

If $E \neq 0, B \neq 0$ but $F_{e} + F_{m} = 0$ , then also velocity may remain constant or option (d) is also correct.

Magnetics 1 Question 24

24. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $E$ and $B$ represent the electric and magnetic fields respectively. Then, this region of space may have

Match the Columns

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Magnetics 1 Question 24

24. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent the electric and magnetic fields respectively. Then, this region of space may have

Match the Columns

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu

24. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $E$ and $B$ represent the electric and magnetic fields respectively. Then, this region of space may have