True or false
Direct current has a frequency of 50 Hz in India

True or false The direct current always in one direction only

(no, loss, loss, direct current, 50 Hz, 0 Hz, alternating current, 220 Hz, infinite) The electric current in which direction of current in constant is called as ______ whereas electric current in which direction of current reverses after equal intervals of time is called __________. When direct curret is transmitted over long distances, there is ________ of energy whereas there is _________ of energy for transmitting alternating current. The frequencies of direct current and alternating current (in India) are _______ and ________ respectively.

For an EM wave propagations along x direction, the magnetic field oscillates along the z-direction at a frequency of 3 xx 10^10 Hz and has amplitude of 10^-9 T. What is the wavelength of the wave?

Find the reactantance of a coil of inductance 100mH at a frequency 50 Hz and 1000 Hz.

True or false Alternating current is perfectly used for domestic electric circuits.

When a guitar string is sounded with a 440 Hz tuning fork a beat frequency of 5 Hz is heard if the experiment is repeated with a tuning fork of 437 Hz ,the beat frequency is 8 Hz .The string frequency (Hz ) is

What should be the tension applied to a wire of length 1 m and mass 1 gram, if it is to vibrate with a fundamental frequency of 50 Hz ?

True or false The SI unit of electric current is volt(V).

In a purely inductive ac circuit L = 25 mH and peak voltage of ac supply is150 V. Find inductive reactance and maximum current if the frequency is 50 Hz.