Question of the day

Q - An infinite square grid of resistances, each R is shown in diagram. If a battery of EMF V with negligible internal resistance is connected between points A and B, what is the current through the battery?

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Q- One mol of an ideal monatomic gas is used as the working substance in an engine. The engine operates on the cycle shown in the diagram. Processes BC and DA are reversible and adiabatic. What is the efficiency of the engine? 

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Q- A small light disc is attached with one end of a spring of constant K, the other end is fixed to ground and stands vertical. a small block of mass m is dropped from a height h above the disc. Considering elastic impact and only vertical motion find the maximum velocity and maximum acceleration of...

A spherical capacitor has two different layers of dielectrics between its plates. Their permittivity are ϵ1 for a < r < r0 and ϵ2 for r0 < r < b. Find the capacitance of this system by finding the total energy of the fields between the plates.

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