Questions by varun

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In a Wheatstone bridge circuit, `P=7 Omega, Q= 8 Omega, R = 12 Omega and S = 7 Omega`. Find the additional resistance to be used in series with `S` , so that the bridge is

asked Mar 20, 2022 in 12th Physics

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A meter bridge is set up as shown in figure, to determine an unknown resistance `X` using a standard `10 Omega` resistor. The galvanometer shows null point when tapping key is at `52 cm` mark. The end-corrections are `1 cm and 2 cm` respectively for the ends A and B. The determined value of `X`

asked Mar 20, 2022 in 12th Physics

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The figure below shows a `2.0 V` potentiometer used for the determination of internal resistance of a `2.5 V` cell. The balance point of the cell in the open circuit is 75 cm. When a resistor of `10 Omega` is used in the external circuit of the cell, the balance point shifts to 65 cm length of potentiometer wire. The internal resistance of the cell

asked Mar 20, 2022 in 12th Physics

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A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is `k` volt/cm and the ammeter, present in the circuit, reads `1.0` A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths `l_1 cm and l_2 cm`, respectively. The magnitudes of the resistors `R and X` in ohm, are then, respectively equal

asked Mar 20, 2022 in 12th Physics

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`10 A` current passes through a copper. The net charge after `5s` in the wire

asked Mar 20, 2022 in 12th Physics

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Au is a highly conductive metal which obeys Ohm’s law but................does not obey Ohm’s law due to lack of conduction

asked Mar 20, 2022 in 12th Physics

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During charging of a cell terminal voltage i s ................ than emf of

asked Mar 20, 2022 in 12th Physics

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The connections between resistors in a meter bridge are made of thick copper strips because thick copper strips have

asked Mar 20, 2022 in 12th Physics

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Long wire of the potentiometer gives lower value of................ which increases sensitivity of

asked Mar 20, 2022 in 12th Physics

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Which of the following statement is correct when power delivered by a battery is

asked Mar 20, 2022 in 12th Physics

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Choose the correct

asked Mar 20, 2022 in 12th Physics

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Match the Column I (graph) with Column II (relation) and select the correct answer from the codes given below. Column I Column II A. p. Temperature dependence of resistivity for a typical semiconductor. B. q. Resistivity p of copper as a function of temperature T. C. r. Resistivity `rho` of nichrome as a function of absolute temperature T .

asked Mar 20, 2022 in 12th Physics

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Assertion: A wire carrying an electrical current has no electric field inside it. Reason: Rate of flow of electrons in one direction is equal to the rate of flow of protons in opposite

asked Mar 20, 2022 in 12th Physics

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Assertion: In electrostatics, all charges whether free or bound are considered to be at rest.Reason: The charges in motion constitute an electric

asked Mar 20, 2022 in 12th Physics

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Assertion: A current flows in a conductor only when there is an electric field within the conductor. Reason: The drift velocity of electrons in presence of electric field

asked Mar 20, 2022 in 12th Physics

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Assertion: Charge carriers do not move with acceleration but with a steady drift velocity. Reason: Charge carriers undergo collisions with ions and atoms during

asked Mar 20, 2022 in 12th Physics

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Assertion: Manganin and constantan are widely used in standard resistors. Reason: For manganin and constantan resistance, values would change very little with

asked Mar 20, 2022 in 12th Physics

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Assertion: If a current is flowing through a conducting wire of non-uniform cross-section, drift speed and resistance both will increase at a section where cross-sectional area is loss. Reason: Current density at such sections is more, where cross-sectional area is

asked Mar 20, 2022 in 12th Physics

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Assertion: The drift velocity of electrons in a metallic wire decreases, when temperature of the wire increases. Reason: On increasing temperature, conductivity of metallic wire

asked Mar 20, 2022 in 12th Physics

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Assertion: The average time of collisions `x` decreases with increasing temperature. Reason: At increased temperature, average speed of the electrons, which act as the carriers of current increases, resulting in more frequent

asked Mar 20, 2022 in 12th Physics

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