Recent questions tagged easy

Three charges $+q, 2q$ and $-4 q$ are placed on the three vertices of an equilateral triangle of each side $0.1\;m$ calculate electrostatic potential energy of the system , take $q= 10^{-7} \;c$

asked Jul 8, 2015 by meena.p

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Potential energy of an electric dipole at an angle $\theta$ in a uniform electric field is zero when $\theta= ?$

asked Jul 8, 2015 by meena.p

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Electric field due to an electric dipole is

asked Jul 8, 2015 by meena.p

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In the figure two positive charges $q_2$ and $q_3$ fixed along the y-axis , exert a net electric force in the $+x$ direction on a change $q_1$ fixed along the x-axis . If a positive charge Q is added at $(x,0)$, then the force on $q_1$

asked Jul 8, 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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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

1 answer

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

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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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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How does the fuse wire save the electrical installation?

asked Jun 30, 2015 by meena.p

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A silver wire has a resistance of $2.1 \Omega$ at $27.5^{\circ}C$ and a resistance of $2.7\Omega$ at $100^{\circ}$. Determine the temperature coefficient of resistivity of silver.

asked Jun 30, 2015 by meena.p

1 answer

A negligibly small current is passed through a wire of length $15\;cm$ and uniform cross section wire of length $6.0 \times 10^{-7}\;m^2$ and its resistance is measured to be $5.0 \Omega$ What is the resistivity of the material at the temperature of the experiment ?

asked Jun 30, 2015 by meena.p

1 answer

The storage battery of a car has an emt of $12\;V$. If the interval resistance of a battery is $0.4 \Omega$, What is the maximum current that can be drawn from the battery ?

asked Jun 30, 2015 by meena.p

1 answer

What are the two practical forms of wheat stone bridge?

asked Jun 30, 2015 by meena.p

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A resistance R is connected across a cell of emf e and internal resistance r. A potentio meter now measures the potential difference between the terminals of the cell as V. Write an expression for r in terms of e, V and R.

asked Jun 30, 2015 by meena.p

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Why is meter bridge also called a slide wire bridge ?

asked Jun 30, 2015 by meena.p

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Two electric lamps A and B are marked. $220\;V- 100\;w$ and $220\;V-60\;W$ Out of the two which lamp has higher resistance ?

asked Jun 30, 2015 by meena.p

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Two wires of equal length one of copper and of mangain have the same resistance which wire in thicker ?

asked Jun 30, 2015 by meena.p

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Name some elements which does not obey ohm's law

asked Jun 29, 2015 by meena.p

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What are the conditions required for making a conductor as a super conductor ?

asked Jun 29, 2015 by meena.p

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A wire of resistivity $\rho$ is stretched to three times its length . What will be the new resistivity ?

asked Jun 29, 2015 by meena.p

1 answer

What is the conductance of a wire of resistance $2\;m \sigma$ ?

asked Jun 29, 2015 by meena.p

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What are the dimensions of electrical conductivity ?

asked Jun 29, 2015 by meena.p

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A wire of resistance $4R$ is bent in the form of a circle. What is the effective resistance between the ends of diameter ?

asked Jun 29, 2015 by meena.p

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a)Three resistor $2 \Omega,4 \Omega$ and $ 5\;\Omega$ are combined in parallel. What is the total resistance of the combination ? b) If the combination is connected to a battery emf $20\;V$ and negligible internal resistance determine the current through each resistor, and the total current drawn from the battery

asked Jun 29, 2015 by meena.p

1 answer

A battery of emf $10\;v$ and internal resistance $3 \Omega$ is connected to a resistor . If the current in the circuit is $0.5\;A$, What is the resistance of the resistor ? What is the resistance of the resistor ? What is the terminal voltage of the battery when the circuit is closed ?

asked Jun 29, 2015 by meena.p

1 answer

The storage battery of a can an ems of $ 12V$ .If the internal resistance of the battery is $ 0.4 \Omega$ What is the maximum current that can be drawn from the battery ?

asked Jun 29, 2015 by meena.p

1 answer

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

asked Jun 29, 2015 by meena.p

1 answer

Alloys usually have lower/higher temperature is nearly independent of / increases rapidy with increase of temperature

asked Jun 29, 2015 by meena.p

1 answer

Alloys of metals have greater / lesser resistivity than that of their constituent metal?

asked Jun 29, 2015 by meena.p

1 answer

What conclusion can you draw from the following observation on a resistor made of allong magnanin ?Choose the correct alternative?

asked Jun 29, 2015 by meena.p

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When electrons drift in a metal from lower to higher potential , does it means that all the free electrons of the metal are moving in the same direction ?

asked Jun 29, 2015 by meena.p

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If the electron drift speed is so small , and the electron's charge is small , how can we still obtain large amount of current in a conductor ?

asked Jun 29, 2015 by meena.p

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The electron drift arises due to the force experience by electrons in the electric field inside the conductor . But force should cause acceleration . When then do the electrons acquire a steady average drift speed ?

asked Jun 29, 2015 by meena.p

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