Physics Test 58...

A junction diode has a resistance of 25Ω when forward-biased and 2500Ω when reverse-biased. The current in the arrangement shown in the figure will be

The motor of an electric train can give it an acceleration of 1 m/s² and its brakes can give it a negative acceleration of 3 m/s². The shortest time in which the train can make a trip between two stations 1350 m apart is

A message signal of frequency 10 kHz and peak voltage 10 V is used to modulate a carrier of frequency 1 MHz and peak voltage 20 V. Determine the modulation index and side bands produced

The depletion layer in a p−n junction diode is 10⁻⁶ m wide and its knee potential is 0.5 V. What is the inner electric field in the depletion region?

110 J joules of heat is added to a gaseous system, whose internal energy is 40 J; then the amount of external work done is

Two uniform metal rods of lengths l₁ and l₂, and linear coefficients of expansion α1 and α2, respectively are connected to form a single rod of length (l₁+l₂). When the temperature of this rod is raised by t^∘C, the length of each rod increases by the same amount. Then, (α₂ / α₁+α₂) is

In Young's experiment, light of wavelength 6000A⁰ is used to produce fringes of width 0.8 mm at a distance of 2.5m. If the whole apparatus is dipped in a liquid of refractive index 1.6 , the fringe width will be

what is the angle between A and B?

If g is the acceleration due to gravity on the surface of the Earth, then the gain in potential energy of an object of mass m raised from the Earth's surface to a height equal to the radius R of the earth is