The ratio of induced emf in a coil of 50 turns and area A oscillating at frequency 50Hz to that in a coil of 100 turns and same area oscillating at frequency 100Hz is:

Wavelength of light of frequency 100 Hz

The product of ampere turn and area of coil is

The inductance of a coil is 0.25 H. Calculate its inductive reactance in a.c. frequency 50 Hz.

The inductive reactance of a choke coil of 1/(4 pi) mH in an A.C. Circuit of frequency 50 Hz is

The bob of a simple pendulum is oscillating with a frequency of 25 Hz. How much time will the pendulum take to make 100 oscillations?

Calculate the maximum emf induced in a coil of 100 turns and 0.01 m^(2) area rotating at the rate of 50 rps about an axis perpendicular to a uniform magnetic field of 0.05 T. If the resistance of the coil is 30 Omega , what is the maximum power generated by it ?

What is the inductive reactance of a coil of inductance 10mH at a frequency (1) 50Hz (2) 1000Hz (3) 20kHz?

An armature coil consists of 20 turns of wire each of area A = 0.09 m^(2) and total resistance 15.0 ohm. It rotates in a magnetic field of 0.5 T at a constant frequency of (150)/(pi) Hz . Calculate the value of (i) maximum and (ii) average induced e.m.f. produced in the coil.

A transformer of frequency 60 Hz and 120 V input has 8:1 turn ratio. The frequency of the output is

The primary coil of an ideal transformer has 100 turns and the secondary coil has 600 turns. Then