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.
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Current Electricity question types
139 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
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2 Marks Questions
36 Q→023 Marks Question
16 Q→031 Marks Question
47 Q→044 Marks Questions
3 Q→05M.C.Q (1 Marks)
37 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.
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 →In the given figure, if the Wheatstone Bridge is balanced, then find the magnitude of unknown resistance $X$. 
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?
State Kirchhoff's laws and explain them by giving examples.###Explain that first law of Kirchhoff is equivalent to law of conservation of charge and the second law is a descriptive form of Ohm's law.###For a current carrying conductor, write Kirchhoff's laws of charge and energy conservation.
What is an electric cell? Describe its construction. How many types of electric cells are there? By defining electromotive force of a cell, establish an expression for internal resistance of cell in any circuit and state factors on which internal resistance depends.
(i) What is meant by electric power? Prove that $P=\frac{V^2}{R}$ or $P=I^2 R$. Define one-watt electric power.(ii) Define electric energy. Prove that $P = I ^2 R \Delta t$
View full solution →Establish an expression for mobility by giving definition of mobility. Establish relation between mobility of free electrons and electric current.
Write difference between terminal voltage and electromotive force of a cell.
Draw a graph between potential difference (V) and current (I) according Ohm's law.
What is internal resistance 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 →If length of a wire of resistivity p is stretched to three times, then what will be new resistivity?
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?
The SI unit of resistivity is:
- A$\Omega / m$
- BΩ
- ✓Ωm
- DΩm²
Answer: C.
View full solution →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.
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 →If current flowing through a conductor is doubled then the heat produced in it is:
- Adoubled
- Bhalf
- ✓four times
- Dsame
Answer: C.
View full solution →Copper and germanium are cooled from room temperature to 30 K. In this process, the resistance:
- Awill decrease for both
- Bwill increase for both
- Cof copper will increase and of germanium will decrease
- ✓of copper will decrease and of germanium will increase
Answer: D.
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