Question
What is the principle behind the working of a
transformer? ÂSolution
A transformer works on Faraday's law of induction.  It uses electromagnetic induction to change the voltage in alternating current (AC) circuits.  A varying current in the primary coil induces a varying magnetic field, which in turn induces a current in the secondary coil.  This allows voltage to be increased or decreased.
A sudden drop in barometric pressure indicates which of the following?
The unit 'Weber' is associated with which of the following?
When a capacitor is fully charged in a DC circuit, the current through it is:
A car accelerates from 20 m/s to 40 m/s in 10 seconds. What is its acceleration?
If n resistors with R Ω each as resistance are connected in parallel, then the equivalent resistance of the network is:
A fish inside water (μ = 4/3) sees the world above through a circular “window” due to total internal reflection. The angular diameter of this windo...
If lift is going up with acceleration, the apparent weight of a body is -
Total mechanical energy =
The polarization of electromagnetic waves demonstrates that they are:
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is New...
