Q: An electron is projected into a magnetic field along the lines of force. Then

if \$\vec{v} \parallel \vec{B}\$then \$\theta\$ = 0\$ \implies \vec{F_B}\$ = 0

Q: The force felt by an electron on entering into a magnetic field is independent of its

\$ \vec{F_B} = q \vec{v} \times \vec{B}\$independent of mass

Q: You are sitting in a room in which uniform magnetic field is present in vertically downward direction. When an electron is projected in horizontal direction, it will be moving in circular path with constant speed

by \$F = q\vec{v} \times \vec{B}\$where \$q\$ is \$-ve\$therefore, it will be moving in a circular path with constant speed clockwise in horizontal plane

Q: An electron and a proton are injected into a uniform magnetic field at right angle to its direction with the same momentum. Then

R = \$ \dfrac{mv}{QB} = \dfrac{P}{QB} \$ [ P is same]Q and B are same in magnitude in case of e and p their path will be equally curved

Q: An electron is not deflected on passing through a certain region, because

only B is possible because \$ \vec{B} \parallel \vec{v}\$

Q: A \$\beta -\$ particle enters a magnetic field making an angle of \$45^{o}\$ with the field lines. The path of the particle is

the \$v_x = \dfrac{v}{\sqrt 2} \$ will be responsible for circular motion and \$v_y\$ will take it in \$+Y\$ direction thus making it a spiral path

Question 1

An electron is projected into a magnetic field along the lines of force. Then

Accepted Answer

if $\vec{v} \parallel \vec{B}$then $\theta$ = 0$ \implies \vec{F_B}$ = 0

Question 2

When a charged particle moves through a magnetic field, the quantity which is not affected in the magnetic field is:

Accepted Answer

Magnetic field does zero work on moving charged particles. Therefore, kinetic energy of particle remains constant.

Question 3

The force felt by an electron on entering into a magnetic field is independent of its

Accepted Answer

$ \vec{F_B} = q \vec{v} \times \vec{B}$independent of mass

Question 4

You are sitting in a room in which uniform magnetic field is present in vertically downward direction. When an electron is projected in horizontal direction, it will be moving in circular path with constant speed

Accepted Answer

by $F = q\vec{v} \times \vec{B}$where $q$ is $-ve$therefore, it will be moving in a circular path with constant speed clockwise in horizontal plane

Question 5

When an electron moves through a magnetic field, its speed will

Accepted Answer

The work done by magnetic force on any moving charge particle is zero because magnetic force acts perpendicular to the direction of motion. Therefore speed will remain same.

Question 6

An electron and a proton are injected into a uniform magnetic field at right angle to its direction with the same momentum. Then

Accepted Answer

R = $ \dfrac{mv}{QB} = \dfrac{P}{QB} $ [ P is same]Q and B are same in magnitude in case of e and p their path will be equally curved

Question 7

An electron enters a magnetic field with a speed of $10^{8} cm/s$. The particle experiences a force due to the magnetic field and the speed of the electron

Accepted Answer

A particle travelling perpendicular to a magnetic field would experience a force given by $F=q(\vec{v}\times \vec{B})$.This force, thus, acts perpendicular to the direction of motion of electron. Hence it only changes the direction of electron but not the speed of electron perpendicular to the direction of motion. This force would cause a constant centripetal acceleration. Thus the speed of electron does not change at all.

Question 8

An electron is not deflected on passing through a certain region, because

Accepted Answer

only B is possible because $ \vec{B} \parallel \vec{v}$

Question 9

A $\beta -$ particle enters a magnetic field making an angle of $45^{o}$ with the field lines. The path of the particle is

Accepted Answer

the $v_x = \dfrac{v}{\sqrt 2} $ will be responsible for circular motion and $v_y$ will take it in $+Y$ direction thus making it a spiral path

Question 10

Imagine that you are sitting in a room with your back to one wall and that an electron beam traveling horizontally from the back wall towards the front one is deflected towards the right. What is the direction of the magnetic induction field that exists in the room?

Accepted Answer

The magnetic field has to be vertically downward for bending electron beam towards right

Moving Charges And Magnetism

Physics
30 Views

An electron is projected into a magnetic field along the lines of force. Then

When a charged particle moves through a magnetic field, the quantity which is not affected in the magnetic field is:

The force felt by an electron on entering into a magnetic field is independent of its

You are sitting in a room in which uniform magnetic field is present in vertically downward direction. When an electron is projected in horizontal direction, it will be moving in circular path with constant speed

When an electron moves through a magnetic field, its speed will

An electron and a proton are injected into a uniform magnetic field at right angle to its direction with the same momentum. Then

An electron enters a magnetic field with a speed of $1 0^{8} c m / s$ . The particle experiences a force due to the magnetic field and the speed of the electron

An electron is not deflected on passing through a certain region, because

A $β -$ particle enters a magnetic field making an angle of $4 5^{o}$ with the field lines. The path of the particle is

Imagine that you are sitting in a room with your back to one wall and that an electron beam traveling horizontally from the back wall towards the front one is deflected towards the right. What is the direction of the magnetic induction field that exists in the room?

Moving Charges And Magnetism

Physics 30 Views

An electron is projected into a magnetic field along the lines of force. Then

When a charged particle moves through a magnetic field, the quantity which is not affected in the magnetic field is:

The force felt by an electron on entering into a magnetic field is independent of its

You are sitting in a room in which uniform magnetic field is present in vertically downward direction. When an electron is projected in horizontal direction, it will be moving in circular path with constant speed

When an electron moves through a magnetic field, its speed will

An electron and a proton are injected into a uniform magnetic field at right angle to its direction with the same momentum. Then

An electron enters a magnetic field with a speed of 108cm/s. The particle experiences a force due to the magnetic field and the speed of the electron

An electron is not deflected on passing through a certain region, because

A β− particle enters a magnetic field making an angle of 45o with the field lines. The path of the particle is

Imagine that you are sitting in a room with your back to one wall and that an electron beam traveling horizontally from the back wall towards the front one is deflected towards the right. What is the direction of the magnetic induction field that exists in the room?

Physics
30 Views

An electron enters a magnetic field with a speed of $1 0^{8} c m / s$ . The particle experiences a force due to the magnetic field and the speed of the electron

A $β -$ particle enters a magnetic field making an angle of $4 5^{o}$ with the field lines. The path of the particle is