Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details
Get extra R 700 off

				   An insulating rod of length l carries a charge q distributed uniformly on it.The rod is pivoted at an end and is rotated at a frequency f about a fixed perpendicular axis.The magnetic moment of the system is?

7 years ago


Answers : (1)



let the charge density on rod be λ = q/l

consider a small element of rod dx at a distance x from the fixed end

 charge on it dq = λ dx

when the rod rotates  the current due to this element , di = f dq

                                                                                 = f λ dx

magnetic moment of this current  element dM = di * area

                                                                = f λ dx * ∏ x^2

total magnetic moment M = ∫ dM =

                                               = ∫0 l  f λ dx * ∏ x^2

                                                = fλ∏ ∫0( x^2 ) dx  

                                                 =  fλ∏/3 * x^3 ]0 l

                                                 =  fλ∏ l^3 /3         

λ l = q , so

         M =  f∏q l^2  /3



7 years ago

Post Your Answer

Other Related Questions on Magnetism

What is Ampere’s law?please give me the brief explanation..
Ampere's Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the...
The main limitation of Ampers law is, the cirrent must be in steady , that means current must be constant in time. The use of Amperes law is to calculate the magnitc field of a given...
The full version of Ampere's Law is one of Maxwell's Equations that describe the electromagnetic force. Ampere's Law specifically, says that the magnetic field created by an electric current...
ULFAT 7 months ago
How to determine which direction of current is taken positive and which is negative in amperes circuital law
To determine which is positive and which is negative you should use the right hand thumb rule.the direction of thumb gives positive directions.
H AGGARWAL 9 months ago
Earth magnetic elements angle of dip ka derivation ​ ​
@ piyush the derivation is a little bit complex at your class 12 th level , so, u need to only remmeber the formula , nothing else , with diagram , the ques in exam will ask you about the...
Umakant biswal one month ago
What is the difference btw current amplification factor and current gain?
current amplification factor can be defined as the ratio of the output current to the ratio of input current . when its passing through an electrical devices . so, it gives us the amount of ...
Umakant biswal 3 months ago
Coulomb’s law states that the electric force becomes weaker with increasing distance. Suppose that instead, the electric force between two charged particles were independent of distance.In...
The charged body will induce an equal and opposite charge on the neutral body which leads to attraction between them. Also ,since both the particles have some mass they will have...
krishna priya 3 months ago
what is meant by radial acceleration?please explain it in detail
Dear Mastan, If an object is in the rotatory motion then it has two components of acceleration.Those are Radial acceleration Tangential acceleration Radial acceleration means the...
SAI SARDAR 7 months ago
Dear, Masthan This centripetal acceleration is directed along a radius so it may also be called the radial acceleration a r . If the speed is not constant, then there is also a tangential...
Mounik 7 months ago
These components are called the tangential acceleration and the normal or radial acceleration (or centripetal acceleration in circular motion, see also circular motion and centripetal force)
pavan picheri 7 months ago
View all Questions »

  • Complete Physics Course - Class 12
  • OFFERED PRICE: R 2,600
  • View Details
Get extra R 650 off

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details

Get extra R 700 off

More Questions On Magnetism

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details