Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?

Related Mcqs:

1. When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?

   A. R=qB/mV
   B. R=mV/qB
   C. R=qmV/B
   D. R=qmB/V

2. If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?

   A. West
   B. North
   C. Down
   D. Up

3. Two parallel wires carrying currents in the opposite directions____________________?

   A. repel each other
   B. attract each other
   C. have no effect upon each other
   D. they cancel out their individual magnetic fields

4. An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?

   A. I = 2I∫Sin(πt/2)
   B. I = 2I∫Sin(2πt)
   C. I = 2ISinπt
   D. I = I∫sin(2πt)

5. When two identical traveling waves are superimposed, the velocity of the resultant wave__________________?

   A. decreases
   B. increases
   C. remains unchanged
   D. becomes zero

6. Which of the following pairs does not have identical dimensions ?

   A. Torque and energy
   B. Momentum and impulse
   C. Energy and work
   D. Mass and moment of inertia

7. The SI unit of force constant is identical with that of__________________?

   A. Force
   B. Pressure
   C. Surface tension
   D. Loudness

8. Two identical metal balls with charges + 2Q and – Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be_________?

   A. F
   B. F/2
   C. F/4
   D. F/8

   Submitted by: Tauseef Ali

9. The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?

   A. 30°
   B. 60°
   C. 90°
   D. 120°

10. The direction of propagation of an electromagnetic waves is________________?

    A. Perpendicular to electric field
    B. Perpendicular to both electric and magnetic field
    C. Perpendicular to magnetic field
    D. Parallel to electric and magnetic field