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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

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

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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

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

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

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

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

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Choose the correct

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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 by varun (6.7k points)

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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

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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

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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

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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

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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

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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

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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

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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

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Assertion: If we bend an insulating wire, the resistance of the wire increases.Reason: The drift velocity of electron in bended wire does not remains

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Assertion: Bulb generally get fused when they are switched ON or OFF. Reason: When we switch ON or OFF, a circuit current changes it

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Assertion: Terminal voltage of a cell is greater than emf of cell during charging the cell. Reason: The emf of a cell is always greater than its terminal

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