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Define the term 'drift velocity' of charge carriers in a conductor. Obtain the expression for the current density in terms of relaxation time
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1
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9584
|
September 7, 2016
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Define the term drift velocity
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1
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21517
|
September 7, 2016
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Derive an expression for drift velocity of free electrons
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1
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86104
|
September 7, 2016
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Two heating elements of resistance R1 and R2 when operated at a constant supply of voltage, V, consume powers P2 and P2 respectively
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1
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3107
|
September 7, 2016
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A cell of emf E and internal resistance r is connected to two external resistances and R2 and a perfect ammeter. The current in the circuit is measured in four different situations :
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1
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3217
|
September 7, 2016
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A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor. If the current in the circuit is 0.5 A, find :
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1
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7656
|
September 7, 2016
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A battery of emf E and internal resistance, r, when connected an external resistance of 12 Q produces a current of 0.5 A
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1
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8788
|
September 7, 2016
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Draw a graph showing variation of resistivity with temperature for nichrome. Which property of nichrome is used to make standard resistance coils?
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0
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12145
|
September 7, 2016
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In the circuit shown in the fisgure, find the total resistance of the circuit and the current in the arm
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1
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5013
|
September 7, 2016
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Distinguish between emf (c) and terminal voltage (V) of a cell having internal resistance r
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1
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11149
|
September 7, 2016
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Draw a plot showing the variation of resistivity of a (i) conductor and (ii) semiconductor, with the increase in temperature
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1
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30173
|
September 7, 2016
|
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A cell of emf 'E' and internal reistance 'r' is connected across a variable resistor 'R'
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1
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10571
|
September 7, 2016
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Calculate the current drawn from the battery by the network of resistors shown in the figure
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1
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15949
|
September 7, 2016
|
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Using the concept of drift velocity of charge carriers in a conductor, deduce the relationship between current density and resistivity of the conductor
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0
|
5246
|
September 7, 2016
|
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Two cells of E.M.E 10 V and 2 V and internal resistances 10Q and 5Q respectively, are connected in parallel as shown. Find the effective voltage across R
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1
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1693
|
September 7, 2016
|
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A battery of emf 12V and internal resistance 2 Q is connected to a 4 Q resistor as shown in the figure
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1
|
11340
|
September 7, 2016
|
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Two cells of emfs 1.5 V and 2.0 V having internal j resistances 0.2Q and 0.3Q respectively are f connected in parallel. Calculate the emf and internal 1 resistance of the equivalent cell.[
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0
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7864
|
September 7, 2016
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Write the expression for the current
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1
|
575
|
September 7, 2016
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A resistance R is connected across a cell of emf E and internal resistance r
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1
|
2400
|
September 7, 2016
|
|
Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
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0
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1741
|
September 7, 2016
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When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?
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0
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1210
|
September 7, 2016
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Two identical cells, each of emf E, having negligible internal resistance, are connected in parallel with each other across an external resistance R. What is the current through this resistance?
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0
|
15028
|
September 7, 2016
|
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A 10 V battery of negligible internal resistance is connected across a 200 V battery and a resistance of 38 fi as shown in the figure. Find the value of the current in the circuit
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1
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20834
|
September 7, 2016
|
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Two students A and B were asked to pick a resistor of 15 kQ from a collection of carbon resistors
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1
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3725
|
September 7, 2016
|
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Why is the terminal voltage of a cell less than its emf?
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0
|
2178
|
September 7, 2016
|
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The emf of a cell is always greater than its terminal voltage. Why ? Give reason
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0
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3352
|
September 7, 2016
|
|
. Show variation of resistivity of copper as a function of temperature in a graph
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0
|
9889
|
September 7, 2016
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How does one explain increase in resistivity of a metal with increase in temperature?
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0
|
6123
|
September 7, 2016
|
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Write the expression for the drift velocity of charge carriers in a conductor of length l across which a potential difference V is applied
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0
|
3659
|
September 7, 2016
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How does the random motion of free electrons in a conductor get affected when a potential difference is applied across its ends?
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0
|
5672
|
September 7, 2016
|