Two parallel wires carrying currents in the opposite directions____________________?
A. repel each other B. attract each other C. have no effect upon each other D. they cancel out their individual magnetic fields
Physics MCQs with Answers
A magnetic field___________________?
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
Which one of the following material is most suitable for making core of an electromagnet ?
A. air B. steel C. Cu-Ni alloy D. soft iron
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
A. 1T = 103 G B. 1T = 10-4 G C. 1T = 10-2 G D. 1T = 104 G
SI unit of flux density is____________________?
A. NA-1m-1 B. NAm-1 C. NmA-1 D. NmA-2
The standard vector symbol for flux density is ____________________?
A. M B. L C. H D. B
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
n instrument which can measure potential without drawing any current is_____________________?
AA. voltmeter B. galvanometer C. cathode ray oscilloscope (CRO) D. ammeter
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
Which one of the following is not an electromechanical instrument ?
A. galvanometer B. voltmeter C. ammeter D. AC transformer and DC generator