Q 1 :    

Given below are two statements:

 

Statement (I): When currents vary with time, Newton's third law is valid only if momentum carried by the electromagnetic field is taken into account.

 

Statement (II): Ampere's circuital law does not depend on Biot-Savart's law.

 

In the light of the above statements, choose the correct answer from the options given below:              [2024]

  • Both Statement I and Statement II are false.

     

  • Statement I is true but Statement II is false.

     

  • Statement I is false but Statement II is true.

     

  • Both Statement I and Statement II are true.

     

(B)    Statement Ist is true

         Statement IInd is false as Ampere's law depends on Biot Savart's law.

 



Q 2 :    

A solenoid of length 0.5 m has a radius of 1 cm and is made up of 'm' number of turns. It carries a current of 5 A. If the magnitude of the magnetic field inside the solenoid is 6.28×10-3T then the value of m is _______ .               [2024]



(500)    μ0ni=B

           n = number of turns per unit length

           μ0(ml)i=B

          m=B.lμ0i=6.28×10-3×0.512.56×10-7×5=500