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Write two important characteristics of equipotential surfaces.
Concept: Equipotential Surfaces
Define the coefficient of self-induction.
Concept: Inductance >> Self Inductance
What are eddy currents?
Concept: Eddy Currents or Foucault Currents
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
Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
State two points of difference between the interference patterns obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.
Concept: Diffraction of Light >> The Single Slit
Write Einstein's photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.
The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from λ1 to λ2. Derive the expressions for the threshold wavelength λ0 and work function for the metal surface.
Concept: Einstein’s Equation - Particle Nature of Light
Answer the following question.
Show that the density of the nucleus is independent of its mass number A.
Concept: Size of the Nucleus
How is a Zener diode fabricated?
Concept: Special Purpose P-n Junction Diodes
Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
Concept: Zener Diode as a Voltage Regulator
Write the two processes that take place in the formation of a p-n junction.
Concept: p-n Junction
Write the property of a junction diode which makes it suitable for rectification of ac voltages.
Concept: Semiconductor Diode
What is the function of a 'Repeater' used in communication system?
Concept: Basic Terminology Used in Electronic Communication Systems
"The outward electric flux due to charge +Q is independent of the shape and size of the surface which encloses is." Give two reasons to justify this statement.
Concept: Electric Flux
Find the equivalent capacitance of the network shown in the figure, when each capacitor is of 1 μF. When the ends X and Y are connected to a 6 V battery, find out (i) the charge and (ii) the energy stored in the network.
Concept: Capacitors and Capacitance
Derive an expression for drift velocity of free electrons.
Concept: Drift of Electrons and the Origin of Resistivity
Distinguish between emf and terminal voltage of a cell.
Concept: Cells, Emf, Internal Resistance
Show variation of resistivity of copper as a function of temperature in a graph.
Concept: Specific Resistance
Explain the term ‘drift velocity’ of electrons in conductor. Hence obtain the expression for the current through a conductor in terms of ‘drift velocity’.
Concept: Drift of Electrons and the Origin of Resistivity
Answer the following question.
A cell of emf E and internal resistance r is connected across a variable resistor R. Plot the shape of graphs showing a variation of terminal voltage V with (i) R and (ii) circuit current I.
Concept: Cells, Emf, Internal Resistance
