Moving company uses a machine to raise a 900 newton refrigerator to the second floor of a building machine consists of a single pulley with a mechanical advantage of 1 how many newtons of input force will it take to raise the refrigerator
when voltage source is connected across an ideal inductor, the current through it is limited by self induced emf( n.d(phi)/ this emf opposes its cause by lenz's law.
when steady dc supply is connected, there is no change of flux and hence no induced emf is developed and inductive reactance offered to steady dc supply is zero.
at the same time this induced emf is proportional to rate of change of magnetic flux/voltage, hence the inductive reactance offered is also proportional to frequency of voltage source.
they both are heterogenous mixtures.
-5, 5 hope this is right
power is defined as rate of work done or rate of energy
so here we can say that
so here correct answer must be
how much work can be done in a given time.
so we need to find the work done in a given period of time and then we will have to find the ratio of total work done and total time taken.