Home
Class 12
PHYSICS
A charge q coulomb moves in a circle at ...

A charge q coulomb moves in a circle at n revolution per second and the radius of the circle is r metre. Then magnetic feild at the centre of the circle is

A

`(2pi q)/(n r)xx10^-7N//Am`

B

`(2piq)/(n r)xx10^-7 N//Am`

C

`(2pi n q)/(r)xx10^-7N//Am`

D

`(2pi q)/(n r)N//Am`

Text Solution

Verified by Experts

The correct Answer is:
C

`B=(mu_0I)/(2r)=(4pixx10^-7xxnq)/(2r)`
`=(2pinq)/(r)xx10^(-7)N//Am" "[because I=(nq)/(t)]`
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC EFFECT OF ELECTRIC CURRENT

    NIKITA PUBLICATION|Exercise MCQs (Sensitivity and accuracy of M.C.G.)|1 Videos
  • KINETIC THEORY OF GASES & RADIATION

    NIKITA PUBLICATION|Exercise MCQs (Question Given in MHT-CET)|79 Videos
  • MAGNETISM

    NIKITA PUBLICATION|Exercise MCQs|249 Videos

Similar Questions

Explore conceptually related problems

An electron makes ( 3 xx 10^5) revolutions per second in a circle of radius 0.5 angstrom. Find the magnetic field B at the centre of the circle.

An infinitely long conductor is bent into a circle as shown in figure. It carries a current I ampere and the radius of loop is R metre. The magnetic induction at the centre of loop is

A charge of 10^(-6)C is describing a circular path of radius 1cm making 5 revolution per second. The magnetic induction field at the centre of the circle is

In total, 10 charges (5 of them are +q each and other 5 are -q each) are placed randomly on the circumference of a circle. The radius of the circle is R. The electric potential at the center of this circle due to these charges will be

A particle moving in uniform circle makes 18 revolutions in 1 minutes. If the radius of the circle is 10 cm, the speed of the particle is

A charge 'e' moves round a circle of radius 'r' with a uniform speed 'v' . The magnitude of the magnetic induction at the centre of the circle is

A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be

A helium nucleus makes full rotation in a circle of radius 0.8 m in 2.5 seconds. The value of magnetic field B at the centre of the circle will be