Current Electricty.
These important questions will definitely help you to scored good marks in the HSC examination. These questions are prepared by making deep analysis.
Question are as follows
1. A voltmeter
has a resistance of 100Ω .What will de its reading when it is connected across
a cell of emf 2V and internal resistance 20Ω ?
2. A voltmeter
has a resistance 30Ω .What will be its reading, when it is connected across a
cell of emf 2V having internal resistance 10Ω ?
3. A battery
of emf 4 volt and internal resistance 1Ω is connected in parallel with another
battery of 1 V and internal resistance1Ω (with their like poles connected together).The
combination is used to send current through an external resistance of 2Ω .
Calculate the current through the external resistance .
4. Two cells
of emf 1.5 volt and 2V having respective internal resistance of 1Ω and 2Ω are
connected in parallel so as to send current in same direction through an
external resistance of 5Ω. Find the current through the external resistance .
5. A set of
three coils having resistance 10Ω,12Ω and 15Ω are connected in parallel. This combination connected in
series with the series combination of three coils of the same resistances.
Calculate the total resistance and current through the circuit , if the battery
of emf V is used for drawing current.
6. Find the
equivalent resistance between the terminals of F and B in the network between
shown in the figure below given that the resistance of each resistor is 10Ω.
7. Obtain the
balancing condition in case of a Wheatstone’s network .
8. Explain
with neat circuit diagram , how you will determine the unknown resistance by
using a meter bridge .
9. State any
two sources of error in meter bridge
experiment . Experiment how they can be minimized.
10.
In wheatstone’s
metrebridge experiment , the null point is obtained in the middle one
third portion of the wire. Why it is recommended?
11.
Describe kelvin’s method of determine the resistance
of galvanometer by using a meterbridge.
12.
Define
or describe a Potentiometer .
13.
Define
Potential Gradient.
14.
What
is potential gradient? How is it measured? Explain .
15.
On
what factors does the potential gradient of the wire depend?
16.
Describe
how a potentiometer is used to compare the emfs of two cell by connecting the
cells individually .
17.
Describe
how a potentiometer is used to compare the emfs of two cells by combination method .
18.
Describe
with the help of a neat circuit diagram how you will determine the internal
resistance of a cell by using a potentiometer. Derive the necessary formula.
19.
State
the use of a potentiometer .
20.
Why
is potentiometer preferred over a voltmeter for measuring emf?
21.
What
are the disadvantage of a potentiometer?
22.
Distinguish
between potentiometer and voltmeter .
23.
Why should not the jockey be slided along the
potentiometer wire?
24.
What
will be the effect on the position of zero deflection if only the current
flowing through the potentiometer wire is
a)increased b)decreased .
25.
A
potential drop per unit length along a wire is 5 x 10-3 V/m. If the emf of a cell balances against length 216 cm
of this potentiometer wire , find the emfs of the cell .
26.
A
potentiometer wire has a length of 1.5 m and resistance of 10 Ω . It is
connected in series with the cell of emf 4 volt and internal resistance 5 Ω .
Calculate the potential drop per
centimeter of the wire .
27.
The
resistance of a potentiometer wire is 8Ω and its length is 8m . A resistance
box and a 2V battery are connected in series with it . What should be the
resistance in box if it is desired to have potential drop of 1V/mm?
28.
When two cells of emfs E1 and E2
are
connected in series so as to assist each other, their balancing length
on a potentiometer is found to be 2.7m .When the cells are connected in series
so as to oppose each other, the balancing length is found to be 0.3m . Compare
the emfs of the two cells .
29.
The
emf of a cell is balanced by a length of 120cm of potentiometer wire . When the
cell is shunted by a resistance of 10 Ω, the balancing length is reduced by
20cm . Find the internal resistance of the cell .
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6. | Superposition of waves | Coming soon |
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8. | Electrostatics | Coming soon |
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13 | AC circuits | Coming soon |
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