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Electric Circuits
Explain if bias voltage is zero you can still measure a photo current explain why?
Electric Circuits
The temperature at which the tungsten filament of a 12V and 36W lamp operates is 1730
oC
. If the temperature coefficient of resistance of tungsten is
6×10−3
/K, find the resistance of the lamp at a room temperature of 20
oC
oC
. If the temperature coefficient of resistance of tungsten is
6×10−3
/K, find the resistance of the lamp at a room temperature of 20
oC
Electric Circuits
in a photo electric setup, a point source of light of power 3.3*10^-3W emits mono energetic photons of energy 4.5eV. the source is located at a distance of 750mm from the center of a stationary metallic sphere of work function 3.1eV and of radius 7.8cm. the efficiency of photo electron emission is one foe ever 10^5 incident photons. assume that the sphere is isolated and initially neutral and that photo electrons are instantly swept away after emission. calculate the number of photo electrons emitted per second
Electric Circuits
What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?
Electric Circuits
A wire of resistance 100 ohm is doubled on itself.The percentage of decrease of its resistance is
(A)25% (B)50% (C)75% (D)20%
(A)25% (B)50% (C)75% (D)20%
Electric Circuits
we know that p=i2(square) R $ also p=v2(square)/r . If we see at the two expressions, there appeared to be a sort of anamloy . In the first expression , power is directly proportional to resistance . Can you explain tis anamoly ?
Electric Circuits
with the aid of a sketch, in your answer book, explain how you would determine the cold resistance of a lamp filament graphically, if you take the readings of the voltage across it and the current through it. in what region of the graph would you take most of your readings and why?
Electric Circuits
A car is traveling at 18.0 km/hr when its driver accelerates uniformly at 10.0 m/s2. When the driver is finished accelerating, the car is traveling at 57.7 km/hr.
How long did the acceleration last?
How long did the acceleration last?
Electric Circuits
Two wires A and B have same lengths and material , have their cross sectional areas 1:4 , what would be the ratio of heat produced in these wires when the voltage across each is constant.
Electric Circuits
What are the types of capacitors I can use in my shortwave receiver??
