Kirchhoff's Laws - Class XII Physics
Covers Kirchhoff's junction rule, loop rule, and their applications in DC circuit analysis including conservation of charge and energy principles
Questions
Point out the right statements about the validity of Kirchhoff's junction rule.
- It is based on conservation of charge
- Outgoing currents add up and are equal to incoming currents at a junction
- Bending or reorienting the wire does not change the validity of Kirchhoff's junction rule
- All of above
Kirchoff's junction law is equivalent to ___________.
- Conservation of energy
- Conservation of charge
- Conservation of electric potential
- Conservation of electric flux
Kirchoffs law of junctions is also called the law of conservation of:
- Energy
- Charge
- Momentum
- Angular momentum
Consider the following two statements:
(A) Kirchhoff's Junction Law follows from conservation of charge.
(B) Kirchhoff's Loop Law follows from conservative nature of electric field.
- Both A and B are correct
- A is correct but B is wrong
- A is correct but A is wrong
- Both A and B are wrong
Kirchoff's first law, i.e., $\sum i = 0$ at a junction, deals with the conservation of
- charge
- energy
- momentum
- angular momentum
Consider the following two statements:
1) Kirchoff's junction law follows from the conservation of charge
2) Kirchoff's loop law follows from the conservation of energy.
Which of the following is correct?
- both 1 and 2 are wrong
- 1 is correct and 2 is wrong
- 1 is wrong and 2 is correct
- both 1 and 2 are correct
State whether given statement is True or False
The sum of all the voltage drops around a single closed loop in a circuit is zero.
- True
- False
Between any two points in a circuit, the sum of all .............. is the same through any pathway.
- charge
- current
- potential difference
- resistance
Kirchoff's voltage law and current law are respectively in accordance with the conservation of
- Charge and momentum
- Charge and energy
- Energy and charge
- Energy and momentum
Kirchhoff's junction law is equivalent to
- conservation of energy
- conservation of charge
- conservation of electric potential
- conservation of electric flux
If the magnitude of voltage in a circuit changes with time between zero to peak value and direction changes periodically then the voltage is called
- Alternative voltage
- direct voltage
- constant voltage
- reversible voltage
Kirchhoff's first law at a junction is based on conservation of
- Angular momentum
- Mass
- Charge
- Energy
For a $DC$ circuit, Kirchoff's rules yield the following equations.
$I _{3}=I _{1}+I _{2}$
$10 = 3I _{1}-2I _{2}$
$50=2I _{2}+9.6I _{3}$
What is the current $I _{2}$ (Amps)?
- $0.131$
- $-1.37$
- $0.245$
- $-3.5$
- $1.00$
Kirchhoff's Loop rule is a direct consequence of law of conservation of
- Charge
- Momentum
- Angular momentum
- Energy
Kirchhoff's first and second law shows the conservation of :-
- linear momentum and angular momentum.
- charge and energy
- mass and energy.
- charge and linear momentum.
Kirchoffs 1st and 2nd laws are based on conservation of
- Energy and charge respectively
- Charge and energy respectively
- Mass and charge respectively
- None of these above
Kirchhoff's first law ie, $\displaystyle \Sigma i=0$ at a junction is based on the law of conservation of
- Charge
- Energy
- Momentum
- Angular momentum
The Kirchhoff's first law $(\displaystyle\sum i=0)$ and second law $\left(\displaystyle \sum iR=\displaystyle\sum E\right)$, where the symbols have their usual meanings, are respectively based on
- Conservation of charge, conservation of energy
- Conservation of charge, conservation of momentum
- Conservation of energy, conservation of charge
- Conservation of momentum, conservation of charge