The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________? April 17, 2025 by admin A. Average current B. Sinusoidal current C. r.m.s current D. Net current
An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ? April 17, 2025 by admin A. 20A B. 20.66A C. 6.66A D. 5.66A
A changing magnetic flux produces around itself an induced_______________? April 17, 2025 by admin A. Magnetic field B. Electric field C. Electromagnetic force D. Artificial gravitational field
The direction of propagation of an electromagnetic waves is________________? April 17, 2025 by admin A. Perpendicular to electric field B. Perpendicular to both electric and magnetic field C. Perpendicular to magnetic field D. Parallel to electric and magnetic field
Electromagnetic waves transport___________________? April 17, 2025 by admin A. Energy B. Momentum C. Mass D. Heat
Electromagnetic waves emitted from antenna are________________? April 17, 2025 by admin A. Stationary B. Longitudinal C. Transverse D. All the above
A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ? April 17, 2025 by admin A. 0.9sec B. 15 sec C. 1.5x105sec D. 0.9x102sec
To find the r.m.s value of an alternating current mathematically we need to have ________________? April 17, 2025 by admin A. Mean value of I2 B. Square root of mean value of I2 C. Square root of I2 D. Square of 1/2
An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ? April 17, 2025 by admin A. I = 2I∫Sin(πt/2) B. I = 2I∫Sin(2πt) C. I = 2ISinπt D. I = I∫sin(2πt)
pure resistor circuit the voltage and current are_______________? April 17, 2025 by admin A. Lagging each other B. They are at 90? phase difference C. They have zero phase difference D. No phase difference
