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

Related Mcqs:

1. 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

2. 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

3. 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

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

   A. BINA cosa
   B. BINA sina
   C. BINA tana
   D. BINA

5. 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

6. When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?

   A. Same
   B. Different
   C. At L will be more than at C
   D. At L will be less than at C

7. 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

8. Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?

   A. 0.1 A
   B. 1:00 AM
   C. current sensitivity
   D. 1 m A

9. A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ?

   A. 0.9sec
   B. 15 sec
   C. 1.5x105sec
   D. 0.9x102sec

10. n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?

    IA. V = VR+VL+VC
    B. V2 = VR2+VL2+VC2
    C. V2 = VR2+(VL-VC)2
    D. V2 = VL2+(VR-VC)2