Very weak magnetic fields are detected by___________________?

Related Mcqs:

1. In the electron microscope, electric & magnetic fields are used as_______________?

   A. Electromagnetic gun
   B. Source of electromagnetic waves
   C. Deflecting charged particle
   D. Converging source of electrons

2. Which of the following are not deflected by electric and magnetic fields ?

   A. Alpha rays
   B. Beta rays
   C. Gamma rays
   D. None of these

   Submitted by: Aamir Balouch

3. Magnetic flux and flux density are related by___________________?

   A. magnetic flux = flux density / area
   B. magnetic flux = flux density x area
   C. flux density = magnetic flux area
   D. flux density = magnetic flux x area

4. Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?

   A. magnetic flux
   B. magnetic field intensity
   C. magnetic induction
   D. self inductance

5. A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?

   A. F=1/B
   B. F=1/Bsinθ
   C. F/0
   D. F=1/Bcosθ

6. If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?

   A. τ = NIAB cosφ
   B. τ = NIAB sinφ
   C. τ = NIAB tanφ
   D. τ = NIAB

7. The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?

   A. 1T = 103 G
   B. 1T = 10-4 G
   C. 1T = 10-2 G
   D. 1T = 104 G

8. The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?

   A. a circle
   B. a spiral
   C. an ellipse
   D. helix

9. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

   A. a straight line parallel to the field
   B. a parabola in a plane perpendicular to the field
   C. a circle in a plane perpendicular to the field
   D. a straight line along its initial direction

10. A changing magnetic flux produces around itself an induced_______________?

    A. Magnetic field
    B. Electric field
    C. Electromagnetic force
    D. Artificial gravitational field