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Use Kirchhoff's rules to obtain conditions for the balance condition in a Wheatstone bridge
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0
|
26642
|
September 7, 2016
|
|
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
|
8958
|
September 7, 2016
|
|
Define the term drift velocity
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1
|
19881
|
September 7, 2016
|
|
Derive an expression for drift velocity of free electrons
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1
|
84922
|
September 7, 2016
|
|
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
|
2996
|
September 7, 2016
|
|
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 :
|
|
1
|
3099
|
September 7, 2016
|
|
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
|
7419
|
September 7, 2016
|
|
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
|
8499
|
September 7, 2016
|
|
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
|
11861
|
September 7, 2016
|
|
In the circuit shown in the fisgure, find the total resistance of the circuit and the current in the arm
|
|
1
|
4785
|
September 7, 2016
|
|
Distinguish between emf (c) and terminal voltage (V) of a cell having internal resistance r
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|
1
|
10690
|
September 7, 2016
|
|
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
|
28247
|
September 7, 2016
|
|
A cell of emf 'E' and internal reistance 'r' is connected across a variable resistor 'R'
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|
1
|
10403
|
September 7, 2016
|
|
Calculate the current drawn from the battery by the network of resistors shown in the figure
|
|
1
|
15451
|
September 7, 2016
|
|
Using the concept of drift velocity of charge carriers in a conductor, deduce the relationship between current density and resistivity of the conductor
|
|
0
|
5103
|
September 7, 2016
|
|
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
|
|
1
|
1594
|
September 7, 2016
|
|
A battery of emf 12V and internal resistance 2 Q is connected to a 4 Q resistor as shown in the figure
|
|
1
|
11161
|
September 7, 2016
|
|
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.[
|
|
0
|
7721
|
September 7, 2016
|
|
Write the expression for the current
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|
1
|
533
|
September 7, 2016
|
|
A resistance R is connected across a cell of emf E and internal resistance r
|
|
1
|
2334
|
September 7, 2016
|
|
Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
|
|
0
|
1698
|
September 7, 2016
|
|
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?
|
|
0
|
1167
|
September 7, 2016
|
|
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?
|
|
0
|
14873
|
September 7, 2016
|
|
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
|
|
1
|
20674
|
September 7, 2016
|
|
Two students A and B were asked to pick a resistor of 15 kQ from a collection of carbon resistors
|
|
1
|
3650
|
September 7, 2016
|
|
Why is the terminal voltage of a cell less than its emf?
|
|
0
|
2125
|
September 7, 2016
|
|
The emf of a cell is always greater than its terminal voltage. Why ? Give reason
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|
0
|
3296
|
September 7, 2016
|
|
. Show variation of resistivity of copper as a function of temperature in a graph
|
|
0
|
9788
|
September 7, 2016
|
|
How does one explain increase in resistivity of a metal with increase in temperature?
|
|
0
|
5981
|
September 7, 2016
|
|
Write the expression for the drift velocity of charge carriers in a conductor of length l across which a potential difference V is applied
|
|
0
|
3586
|
September 7, 2016
|