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Obtain an expression for the self-inductance of a solenoid.
Concept: Inductance >> Self Inductance
Draw a neat labelled circuit diagram of a full-wave rectifier using a semiconductor diode.
Concept: p-n Junction Diode as a Rectifier
In a common base configuration, the transistor has an emitter current of 10 mA and a collector current of 9.8 mA. The value of base current is ______
Concept: Bipolar Junction Transistor (BJT)
For a transistor IC = 15 mA, IB = 0.5 mA. What is the current amplification factor?
Concept: Bipolar Junction Transistor (BJT)
An emf of 91 mV is induced in the windings of a coil when the current in o nearby coil is increasing at the rate of 1.3 A/s. what is the mutual inductance (M) of the two coils in mH?
Concept: Inductance >> Mutual Inductance
What is a rectifier?
Concept: p-n Junction Diode as a Rectifier
What is the average value of alternating current over a complete cycle?
Concept: Power in AC Circuit
Explain the working of the n-p-n transistor in a common base configuration.
Concept: Bipolar Junction Transistor (BJT)
What is a Light Emitting Diode?
Concept: Special Purpose Junction Diodes
Draw Light Emitting Diode circuit symbol.
Concept: Special Purpose Junction Diodes
Derive the equation for a transformer.
Concept: Transformers
Define α.
Concept: Bipolar Junction Transistor (BJT)
Define β
Concept: Bipolar Junction Transistor (BJT)
The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.
Concept: Inductance >> Self Inductance
The energy of photon of wavelength X is_____ .
[h = Planck’s constant, c = speed of light in vacuum]
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric work function for a metal surface is 2.3 eV. If the light of wavelength 6800A is incident on the surface of metal, find threshold frequency and incident frequency. Will there be an emission of photoelectrons or not?
[Velocity of light c = 3 x 108 m/s,
Planck’s constant, h = 6.63 * 10-34 Js ]
Concept: Photoelectric Effect - Hertz’s Observations
The threshold wavelength of silver is 3800Å. Calculate the maximum kinetic energy in eV of photoelectrons emitted, when ultraviolet light of wavelength 2600Å falls on it.
(Planck’s constant, h =6.63 x 1O-34J.s.,
Velocity of light in air, c = 3 x 108 m / s)
Concept: Einstein’s Equation - Particle Nature of Light
The photoelectric current in a photoelectric cell can be reduced to zero by a stopping potential of 1.8 volt. Monochromatic light of wavelength 2200Å is incident on the cathode. Find the maximum kinetic energy of the photoelectrons in joules. [Charge on electron = 1.6 x 10-19 C]
Concept: Photoelectric Effect - Hertz’s Observations
