A disc of $$10.0 \mathrm{~cm}$$ diameter is rotated at speed of $$3600 \mathrm{~rpm}$$ inside a long solenoid of 1200 turns per metre on the axis of the solenoid and perpendicular to the plane of the disc. When a current of $$1.5 \mathrm{~A}$$ is passed through the solenoid, the difference in the potential between axes and circumference of the disc is nearly
If two metallic plates of equal thickness and thermal conductivities $$K_1$$ and $$K_2$$ are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be
Which of the following is arranged in forward bias?
A TV tower has a height of $$75 \mathrm{~m}$$. What is the maximum distance upto which this TV transmission can be received? (Take, radius of the earth $$=6.4 \times 10^6 \mathrm{~m}$$)