In the given figure, if the Wheatstone bridge is in balanced condition, then the value of resistance 'S' will be
- A12 Ω
- B9 Ω
- C3.0 Ω
- ✓6 Ω
Answer: D.
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Current Electricity question types
157 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
157
Questions
7
Question groups
5
Question types
01
M.C.Q [1M]
37 Q→021 Marks Question
49 Q→03Short Answer Type Questions [2M]
37 Q→043 Marks Question
20 Q→054 Marks Questions
4 Q→06Long Answer Type Questions [5M]
1 Q→07Fill in the blanks.[1M]
9 Q→Sample Questions
Current Electricity questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The SI unit of resistivity is:
- A$\Omega / m$
- BΩ
- ✓Ωm
- DΩm²
Answer: C.
View full solution →Electron and proton beams are travelling parallel to each other in the same direction. There will be ___________ between them.
- Aforce of attraction
- ✓force of repulsion
- Cneither attraction nor repulsion
- Dattractive or repulsive forces depends on the motion of the beams
Answer: B.
View full solution →Magnitude of pursuit velocity does not depend on :
- Across-section of the wire
- ✓length of the wire
- Cthe number of free electrons
- Dmagnitude of current
Answer: B.
View full solution →If resistance of a conductor is reduced to half and magnitude of current is doubled, then produced heat:
- Awill remain the same
- Bwill become half
- ✓will be double
- Dwill become four times
Answer: C.
View full solution →Draw a graph between potential difference (V) and current (I) according Ohm's law.
What is internal resistance of a cell?
Write difference between terminal voltage and electromotive force of a cell.
Electromotive forces of two cells are $\varepsilon_1$ and $\varepsilon_2$ and their internal resistances are $r_1$ and $r_2$ Both cells are joined in lateral combination. Write equivalent electromotive force of this combination.
View full solution →A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10-7 m2 ,and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?
If 12 resistances each of $12 \Omega$ resistance are joined in a cubical network, then calculate the equivalent resistance at the corners opposite to diagonals of this network.
View full solution →A silver wire has a resistance of 2.1 Ω at 27.5${ }^{\circ} C$, and a resistance of 2.7 Ω at 100 ${ }^{\circ} C$. Determine the temperature coefficient of resistivity of silver.
View full solution →In the given figure, point A is at zero potential. Use Kirchhoff's rules to find out the potential at B.
Calculate the magnitude of equivalent resistance across the points $a$ and $b$ in the network shown in the given figure.
View full solution →Calculate the value of $i$ as shown in the figure.
View full solution →Obtain essential expression for balanced position of Wheatstone Bridge.###Explain the principle of Wheatstone Bridge. How can we find the resistance of any resistor using this principle?
A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?
A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27${ }^{\circ} C$ ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is $1.70 \times 10^{-4}{ }^{\circ} C ^{-1}$.
View full solution →At room temperature (27.0 ${ }^{\circ} C$) the resistance of a heating element is 100 Ω. What is the temperature of the element if the resistance is found to 117 Ω, given that the temperature coefficient of the material of the resistor is $1.70 \times 10^{-4}{ }^{\circ} C ^{-1}$.
View full solution →A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?
The number of free electrons in a unit volume copper conductor estimated in Example 8.1 is 8.5 x 1028 per m3.How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 x 10-6 m2and it is carrying a current of 3.0 A.
In the given figure, a part ABC of electric circuit is shown. The magnitudes of potentials at points $A, B$ and $C$ are and respectively, then find the value of potential at point $O$.
View full solution →A thick wire of $15 \Omega$ is stretched to three times its original length. Assuming that the density of the wire remains unchanged, calculate the resistance of the new wire.
View full solution →A wire is stretched to reduce its diameter to half. What will be the magnitude of its new resistance?
Determine the current in each branch of the network shown in Fig.:
The magnitude of drift velocity of electron per unit electric field is called __________.
Kirchhoff's loop rule is result of conservation of ___________.
Kirchhoff's current rule is as a result of conservation of ____________.
According to Kirch off's law, the ____________of all currents meeting at a junction is zero.
Internal resistance of the cell depends on electrolyte and ___________.
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