The effective way to increase the sensitivity of a moving coil galvanometer is to___________________? April 17, 2025 by admin 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
When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________? April 17, 2025 by admin A. a straight line parallel to the field B. a parabola in a plane perpendicular to the field C. a circle in a plane perpendicular to the field D. a straight line along its initial direction
Galvanometer is a very sensitive device with______________________? April 17, 2025 by admin A. very low damping B. very high damping C. no damping at all D. radial field disintegration
Heating a magnet will ____________________? April 17, 2025 by admin A. weaken it B. strengthen it C. reverse its polarity D. demagnetize it completely
A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ? April 17, 2025 by admin A. 4 volt B. 5 volt C. 2 volt D. 0.4 volt
An alternating current or voltage_____________________? April 17, 2025 by admin A. fluctuates off and on B. varies in magnitude alone C. changes its direction again and again D. changes its magnitude harmonically and reverses its direction of…
Electromagnetic waves travel in free space with the speed of___________________? April 17, 2025 by admin A. λ-rays B. Positive rays C. Cathode rays D. More than sound waves
An electromagnetic wave consists of _____________________? April 17, 2025 by admin A. Electric and magnetic fields moving parallel to each other B. Magnetic field moving with velocity of light in space C. Electric field moving with velocity of light D. Electric and magnetic fields moving perpendicular to each other
Waves emitted from the antenna are__________________? April 17, 2025 by admin A. Sound waves B. Electromagnetic waves C. Radio waves D. Modulated waves
If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________? April 17, 2025 by admin A. Twice B. One half C. Four times D. None
