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

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. A magnetic compass will be deflected if it is kept near a____________________?

   A. charge in motion
   B. charge at rest
   C. both
   D. none

3. Very weak magnetic fields are detected by___________________?

   A. Squids
   B. Magnetic resonance imaging (MRI)
   C. Magnetometer
   D. Oscilloscope

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. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?

   A. E = BeV
   B. B = eE/V
   C. E = BV
   D. E = BeV/2

8. A bird sitting on a high tension electric wire does not get electrocuted because:

   A. Sit has high resistance
   B. the body is earthed
   C. it does not form a closed path for the flow of current
   D. its feet are good insulators

   Submitted by: Abid Hussain

9. What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?

   A. 1A
   B. 10A
   C. 100A
   D. 1000A

10. 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