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Draw a circuit diagram of a transistor amplifier in CE configuration.
Concept: Junction Transistor > Transistor as an Amplifier (Ce-configuration)
A resistance of R Ω draws current from a potentiometer as shown in the figure. The potentiometer has a total resistance Ro Ω. A voltage V is supplied to the potentiometer. Derive an expression for the voltage across R when the sliding contact is in the middle of the potentiometer.
Concept: Metre Bridge
Derive an expression for the mutual inductance of two long co-axial solenoids of same length wound one over the other,
Concept: Solenoid and the Toroid - the Solenoid
State the underlying principle of a cyclotron. Write briefly how this machine is used to accelerate charged particles to high energies
Concept: Motion in Combined Electric and Magnetic Fields > Cyclotron
Why is it necessary to introduce a cylindrical soft iron core inside the coil of a galvanometer?
Concept: Moving Coil Galvanometer
Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.
Concept: Electromagnetic Spectrum
Which mode of propagation is used by short wave broadcast serves?
Concept: Electromagnetic Waves
Write two uses of the following radiation.
X-rays
Concept: Electromagnetic Spectrum
Write two important limitations of a refracting telescope over a reflecting-type telescope.
Concept: Optical Instruments: Telescope
Define the term 'intensity of radiation' in terms of photon picture of light.
Concept: Experimental Study of Photoelectric Effect
Write Einstein’s photoelectric equation?
Concept: Einstein’s Photoelectric Equation: Energy Quantum of Radiation
Write two important limitations of Rutherford's nuclear model of the atom.
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Derive the mathematical expression for law of radioactive decay for a sample of a radioactive nucleus
Concept: Law of Radioactive Decay
Define Electric Flux. Write its SI unit.
Concept: Electric Flux
On what factors does the potential gradient of the wire depend?
Concept: Potentiometer
Define mutual inductance.
Concept: Inductance > Mutual Inductance
Two cells of emf E1 and E2 and internal resistances r1 and r2 are connected in parallel. Derive the expression for the (i) emf and (ii) internal resistance of a single equivalent cell which can replace this combination.
Concept: Induced e.m.f. and Induced Current
Draw a labelled diagram of an ac generator.
Concept: A.C. Generator
Obtain the expression for the emf induced in the rotating coil of N turns each of cross-sectional area A, in the presence of a magnetic field `vecB` .
Concept: A.C. Generator
A series LCR circuit is connected across an a.c. source of variable angular frequency 'ω'. Plot a graph showing variation of current 'i' as a function of 'ω' for two resistances R1 and R2 (R1 > R2).
Answer the following questions using this graph :
(a) In which case is the resonance sharper and why?
(b) In which case in the power dissipation more and why?
Concept: Different Types of AC Circuits: AC Voltage Applied to a Series LCR Circuit
