Physics Test 13...

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to a times its original magnitude, 

A, B, C, D, E, F are conducting plates each of area A and any two consecutive plates separated by a distance d. The net energy stored in the system after the switch S is closed is

The resistance of the coil of an ammeter is R. The shunt required to increase its range n-fold should have a resistance

A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is

As the temperature increases, the electrical resistance

In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be

Given below are two statements

Assertion: Biot-Savart’s law gives us the expression for the magnetic field strength of an infinitesimal current element (Idl) of a current carrying conductor only.

Reason: Biot-Savart’s law is analogous to Coulomb’s inverse square law of charge q, with the former being related to the field produced by a scalar source, Idl while the latter being produced by a vector source, q. In light of above statements choose the most appropriate answer from the options given below

According to scientific investigation, the visible region's highest solar radiation intensity occurs at a wavelength of 480 nm. Calculate the temperature of the surface of sun (Given Wein's constant b = 2.88 × 10-3 m K).