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
In a multi range ammeter as the range increases _____________________?
(A) shunt value decreases
(B) shunt value increases
(C) shunt value remains the same
(D) none of the above
Which one of the following is not an electromechanical instrument ?
(A) galvanometer
(B) voltmeter
(C) ammeter
(D) AC transformer and DC generator
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
n instrument which can measure potential without drawing any current is_____________________?
(A) voltmeter
(B) galvanometer
(C) cathode ray oscilloscope (CRO)
(D) ammeter
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
Value of permeability of free space in SI units is___________________?
(A) 4πx10-9 WbA-1m-1
(B) 4πx10-7 WbA-1m-1
(C) 4πx10-10 WbA-1m-1
(D) 4πx10-8 WbA-1m-1
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