Recent questions tagged ch-3

Degree of ionization does not depend on

asked Sep 16, 2015 by meena.p

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Dissolution of an electrolyte in water into negative positive ions is called

asked Sep 16, 2015 by meena.p

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The theory of ionization was represented by

asked Sep 16, 2015 by meena.p

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An electrolyte is a substance which :

asked Sep 16, 2015 by meena.p

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Determine the current though the battery of internal resistance $0.5 \Omega$ for the circuit as shown in the figure. How much power is distributed in $6 \Omega$ resistance ?

asked Jul 8, 2015 by meena.p

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Two batteries of emf $e_1$ and $e_2(e_2 > e_1)$ and internal resistance $r_1$ and $r_2$ respectively are connected in parallel as shown in the figure

asked Jul 7, 2015 by meena.p

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Consider circuit in the given figure. How much energy is absorbed by electron from the initial state of no current (ignore thermal motion ) to the state of drift velocity ?

asked Jul 7, 2015 by meena.p

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The adjacent fig shows a $2.0 \;V$ potentiometer used for the determined of internal resistance of a cell $1.5 \;v$ cell. The balance point of the cell is open circuit is $76.3 \;cm$ . When a resistor of $9.5 \Omega$ is used in the external circuit of the cell, the balance point shifts to $6.48 \;cm$ length of the wire . Determine the internal resistance of the cell

asked Jul 7, 2015 by meena.p

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Determine the current drawn from a 12 v supply with internal resistance $0.5 \Omega$ by the infinite network shown in the figure . Each resistor has $\Omega$ resistance

asked Jul 7, 2015 by meena.p

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Determine equivalent resistance of network shows in the figure.

asked Jul 7, 2015 by meena.p

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Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{5}$$\Omega$

asked Jul 6, 2015 by meena.p

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Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{3}$$\Omega$

asked Jul 6, 2015 by meena.p

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Draw V-I graph for ohmic and non- ohmic materials give one example each

asked Jul 6, 2015 by meena.p

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When the galvanometer shows no deflection , what will be the current flowing through the $5 \Omega$ resistance ?

asked Jul 6, 2015 by meena.p

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Five equal resistor of each $R \Omega$ are connected as shown in the figures. calculate the equivalent resistance between A and B

asked Jul 6, 2015 by meena.p

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The colour coded resistor is as shown in the figure . Compute in mega ohm

asked Jul 6, 2015 by meena.p

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Determine the equivalent resistors of the network shown :

asked Jul 6, 2015 by meena.p

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An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in parallel , find the time taken to boil the water in the kettle .

asked Jul 3, 2015 by meena.p

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An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series , find the time taken to boil the water in the kettle .

asked Jul 3, 2015 by meena.p

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An immersion heater is rated $836 walt$ In what time it should heat litre of water from $20^{\circ}$ to $40^{\circ}? J= 4.18 \;J/cal $

asked Jul 3, 2015 by meena.p

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The earth's surface has a negative surface charge density of $ 10^{-9}cm^{-2}$. The potential difference of $400\;kv$ between the top of the atmosphere and the surface results (due to low conductivity of the lower atmosphere ) in a current of only $1800\;A$ over the entire globe. If their were no mechanism of sustaining atmosphere field, how much time (roughly) would be required to neutralise the the earth's surface ? (This never happen in practice became there is a mechanism to replenish electric charges namely the continual thunder storms and lighting in different parts of the globe) . Radius of the earth $=6.37 \times 10^6m$

asked Jul 3, 2015 by meena.p

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Which of the following : characteristic of electrons . determines the current in a conductor ?

asked Jul 3, 2015 by meena.p

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A metal rod of length $10\;cm$ and a rectangular . Cross section of $1 \;cm \times \large\frac{1}{2}$$\;cm$ is connected to a battery across opposite faces. The resistance will be

asked Jul 3, 2015 by meena.p

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Given resistance of $1 \Omega, 2 \Omega$ and $3 \Omega$ how will we combined them to get an equivalent resistance of $\large\frac{6}{11}$$ \Omega$

asked Jul 3, 2015 by meena.p

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Given resistance of $1 \Omega, 2 \Omega$ and $3 \Omega$ how will we combined them to get an equivalent resistance of $6 \Omega$

asked Jul 3, 2015 by meena.p

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Given n resistor each resistance R, What is the ratio of the maximum to minimum resistance ?

asked Jul 3, 2015 by meena.p

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Given n resistance R, how will you combine them to get the minimum effective resistance ?

asked Jul 3, 2015 by meena.p

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Given n resistor each resistance R, how will you combine them to get the maximum effective resistance ?

asked Jul 3, 2015 by meena.p

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The resistivity of a typical insulator (eg: amber) is greater than that of a metal by a factor of the order of ____$(10^{22}/10^{23})$

asked Jul 2, 2015 by meena.p

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The resistivity of the alloy mangain is nearly ____(independent of /increase rapidly) with increase of temperature

asked Jul 2, 2015 by meena.p

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Choose the correct alternative: Alloys usually have must ______( lower/higher ) temperature coefficients of resistance than pure metals

asked Jul 2, 2015 by meena.p

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Choose the correct alternative : Alloys of metals usually have___________ (greater / lesser) resistivity than that of their constituent metals

asked Jul 2, 2015 by meena.p

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A high tension (HT) supply of say $6kv$ must have a very large internal resistance . Why ?

asked Jul 2, 2015 by meena.p

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A low voltage supply from which one needs high currents must have low internal resistance why ?

asked Jul 2, 2015 by meena.p

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Is Ohm's law universally applicable for all conducting elements? If not give examples of elements which do not obey ohm's law

asked Jul 2, 2015 by meena.p

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A steady current flow in a metallic conductor of non - uniform cross - section which of these quantities is constant along the conductor

asked Jul 2, 2015 by meena.p

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Explain why aluminium Wires are preferred for overhead power cables?

asked Jul 2, 2015 by meena.p

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Two wires of equal lengths , One of aluminium and the other of copper have the same resistance . Which of the two wires is lighter. $[\rho_A =2.63 \times 10^{-8} \Omega m, \rho_{cn}= 1.72 \times 10^{-8} \Omega -m$. Relative density of $Al =2.7$ , Relative density of $Cu= 8.9 ]$

asked Jul 2, 2015 by meena.p

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A secondary cell after long use has an emt of $1.9\;V$ and a large internal resistance of $ 380 \Omega$ What maximum current can be drawn from the cell ?

asked Jul 1, 2015 by meena.p

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Six lead acid type of secondary cells each of emf $2.0V$ and internal resistance $0.015\Omega$ are joined in series to provide a supply to a resistance of $8.5 \Omega$ What are the current drawn from the supply and its terminal voltage ?

asked Jul 1, 2015 by meena.p

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What is the purpose of having a series resistor in the charging circuits?

asked Jul 1, 2015 by meena.p

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A storage battery of emf $8.0 V$ and internal resistance $0.5 \Omega$ is being changed by a $120\;V$ DC supply using a series resistor of $15. 5 \Omega$ What is the terminal voltage of the battery during changing ?

asked Jul 1, 2015 by meena.p

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The number of density of free electron in a copper conductor estimated at $8.5 \times 10^{20}m^{-3}$. How long does an electron take a drift from one end of a wire $3.0 \; m$ long to its other end ? The area of cross - section of the wire is $2 \times 10^{-6}\;m^2$ and it is carrying of $3.0 \;A$

asked Jul 1, 2015 by meena.p

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In a potentiometer arrangement, a cell of emt $1.25\;V$ gives a balance point at $35. 0\;cm$ length of the wire. If the cell is replaced by another cell and the balance point shifts $63.0\;cm$, What is the emf of the second cell ?

asked Jul 1, 2015 by meena.p

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In a metre bridge , the balance point is found to be at $39.5\;cm$ from the end A, when the resistor Y is of $12.5 \;ohm$. Determine the resistance of x. Why are the connections between resistors in a metre bridge made of thick copper ships ? What happens if the galvanometer and cell are interchanged at the balanced point of the bridge ? would the galvanometer show any current?

asked Jul 1, 2015 by meena.p

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Define the term electrical resistivity of a material. Write the S.I units. Derive an expression for the resistivity of a metal in terms of number density and mass of free electrons present in it .

asked Jul 1, 2015 by meena.p

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What is the Potential gradient? How is it measured? Explain

asked Jul 1, 2015 by meena.p

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If the length of the wire be doubled, What will be effect on the position of zero deflection in a potentio meter ? Explain

asked Jul 1, 2015 by meena.p

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Kirchhoff's first law obeys rule of conservation of charge Explain

asked Jun 30, 2015 by meena.p

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How does the fuse wire save the electrical installation?

asked Jun 30, 2015 by meena.p

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