Which one of the following is not an electromechanical instrument ?
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A. galvanometer
B. voltmeter
C. ammeter
D. AC transformer and DC generator
Physics MCQ's
When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
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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_____________________?
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AA. 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_________________?
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A. E = BeV
B. B = eE/V
C. E = BV
D. E = BeV/2
The standard vector symbol for flux density is ____________________?
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A. M
B. L
C. H
D. B
SI unit of flux density is____________________?
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A. NA-1m-1
B. NAm-1
C. NmA-1
D. NmA-2
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
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A. 1T = 103 G
B. 1T = 10-4 G
C. 1T = 10-2 G
D. 1T = 104 G
Which one of the following material is most suitable for making core of an electromagnet ?
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A. air
B. steel
C. Cu-Ni alloy
D. soft iron
A magnetic field___________________?
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A. always exerts a force on a charged particle
B. never exerts a force on a charged particles
C. exerts a force if the charged particle is moving in the direction of the magnetic field lines
D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Two parallel wires carrying currents in the opposite directions____________________?
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A. repel each other
B. attract each other
C. have no effect upon each other
D. they cancel out their individual magnetic fields