Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 ux N.
 5 × 10-5 uz N.
 5 × 10-5 uy N.
  - 5 × 10-5 uy N.

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Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 both of sphere will have same potential.
 larger sphere will have greater potential.
 larger sphere will have smalled potential.
 smaller sphere will have zero potential.

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