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Standard XI

Physics

Circular Kinematics

A particle ca...

Question

A particle carrying a charge $q$ , moves with a constant angular speed $ω$ on a circular path. The radius of this path is $r$ & center is at origin, how many times does the magnetic field become zero at point $(2 r, 4 r)$

1 time

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2 times

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Never

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3 times

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Solution

The correct option is B 2 times

At two positions $\to v$ becomes parallel to position vector, at this instant, $\to B$ becomes zero.

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Similar questions

Q. A particle carrying a charge

q

, moves with a constant angular speed

ω

on a circular path. The radius of this path is

r

& center is at origin, how many times does the magnetic field become zero at point

(2 r, 4 r)

Q. An

α

-particle is moving along a circle of radius

R

with a constant angular velocity

ω

. Point

A

lies in the same plane at a distance

2 R

from the center. Point

A

records magnetic field produced by the

α

-particle. If the minimum time interval between successive times at which

A

records zero magnetic field is

t

, the angular speed

ω

, in terms of

t

, is :

Q. A particle of charge

q

and mass

m

moves in a circular path of radius

r

in a uniform magnetic field

B

at a speed

v

.
The particle is replaced with a particle of identical mass and charge

q

, moving at speed

v

.
The radius of the new circular path the particle makes is:

Q. A particle of charge

q

and mass

m

moves in a clockwise circular path of radius

r

in a uniform magnetic field

B

at a speed

v

. The particle is replaced with a particle of identical mass and charge

q

, moving at speed

v

.
The radius and direction of the new circular path the particle makes is:

Q. An electron is at

P

t = 0

. It is circulating in anticlockwise direction with a constant angular speed

ω

along the shown circular path. Magnetic field at

Q (C Q = 2 R,

where is

R

radius of the circle

)

will be recorded as zero at times.

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A particle carrying a charge q, moves with a constant angular speed ω on a circular path. The radius of this path is r & center is at origin, how many times does the magnetic field become zero at point (2r,4r)

The correct option is B 2 times At two positions →v becomes parallel to position vector, at this instant, →B becomes zero.

A particle carrying a charge $q$ , moves with a constant angular speed $ω$ on a circular path. The radius of this path is $r$ & center is at origin, how many times does the magnetic field become zero at point $(2 r, 4 r)$

The correct option is B 2 times

At two positions $\to v$ becomes parallel to position vector, at this instant, $\to B$ becomes zero.