Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?

Related Mcqs:

1. 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

2. When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?

   A. zero
   B. equal to the restoring couple
   C. greater than the restoring couple
   D. smaller than the restoring couple

3. A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?

   A. 2.0 mA
   B. 20 mA
   C. 200 mA
   D. 0.2 mA

4. The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?

   A. 18Ω
   B. 30Ω
   C. 24Ω
   D. 12Ω

5. An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ?

   A. 10mH
   B. 12mH
   C. 16mH
   D. 20mH

6. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?

   A. 4 volt
   B. 5 volt
   C. 2 volt
   D. 0.4 volt

7. The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?

   A. use a very long and fine suspension
   B. use a coil of very large area
   C. use a coil with very large number of turns
   D. use a very strong magnetic field

8. 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

9. 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

10. 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