Two parallel wires carrying currents in the opposite directions____________________? April 17, 2025 by admin A. repel each other B. attract each other C. have no effect upon each other D. they cancel out their individual magnetic fields
A magnetic field___________________? April 17, 2025 by admin 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…
Which one of the following material is most suitable for making core of an electromagnet ? April 17, 2025 by admin 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_________________? April 17, 2025 by admin A. 1T = 103 G B. 1T = 10-4 G C. 1T = 10-2 G D. 1T = 104 G
SI unit of flux density is____________________? April 17, 2025 by admin A. NA-1m-1 B. NAm-1 C. NmA-1 D. NmA-2
The standard vector symbol for flux density is ____________________? April 17, 2025 by admin 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_________________? April 17, 2025 by admin 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_____________________? April 17, 2025 by admin A. voltmeter B. galvanometer C. cathode ray oscilloscope (CRO) D. ammeter
When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________? April 17, 2025 by admin 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 ? April 17, 2025 by admin A. galvanometer B. voltmeter C. ammeter D. AC transformer and DC generator
