A resistor of resistance $R$ is connected to an ideal battery. If the value of $R$ is decreased, the power dissipated in the resistor will:
- ✓Increase.
- BDecrease.
- CRemain unchanged.
- Dnone
Answer: A.
View full solution →Question types
Electric Current in Conductors question types
119 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
119
Questions
5
Question groups
5
Question types
01
M.C.Q (1 Marks)
19 Q→021 Marks Question
12 Q→032 Marks Questions
21 Q→043 Marks Question
15 Q→055 Marks Questions
52 Q→Sample Questions
Electric Current in Conductors questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Two non$-$ideal batteries are connected in parallel. Consider the following statements:
- The equivalent emf is smaller than either of the two emfs.
- The equivalent internal resistance is smaller than either of the two internal resistances.
- ABoth $A$ and $B$ are correct.
- B$A$ is correct but $B$ is wrong.
- ✓$B$ is correct but $A$ is wrong.
- DBoth $A$ and $B$ are wrong.
Answer: C.
View full solution →Two resistors $A$ and $B$ have resistances $R_A$ and $R_B$, respectively, and $R_A$
- A$\rho _\text{A}>\rho _\text{B}$
- B$\rho _\text{A}=\rho _\text{B}$
- C$\rho _\text{A}<\rho _\text{B}$
- ✓The information is not sufficient to find the relation between $\rho _\text{A}$ and $\rho _\text{B}.$
Answer: D.
View full solution →Two non$-$ideal batteries are connected in series. Consider the following statements:
- The equivalent emf is larger than either of the two emfs.
- The equivalent internal resistance is smaller than either of the two internal resistances.
- AEach of $A$ and $B$ are correct.
- ✓$A$ is correct but $B$ is wrong.
- C$B$ is correct but $A$ is wrong.
- DEach $A$ and $B$ are wrong.
Answer: B.
View full solution →As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
- AIncreases.
- BDecreases.
- CRemains constant.
- ✓May increase or decrease.
Answer: D.
View full solution →Would you prefer a voltmeter or a potentiometer to measure the emf of a battery?
Is work done by a battery always equal to the thermal energy developed in electrical circuit? What happens if a capacitor is connected in the circuit?
Does a conductor become charged when a current is passed through it?
Sometimes it is said that "heat is developed" in a resistance when there is an electric current in it. Recall that heat is defined as the energy being transferred due to temperature difference. Is the statement in quotes technically correct?
We often say, "A current is going through the wire." What goes through the wire, the charge or the current?
An electron gun emits $2.0 × 10^{16}$ electrons per second. What electric current does this correspond to?
View full solution →Can the potential difference across a battery be greater than its emf?
Consider a circuit containing an ideal battery connected to a resistor. Do "work done by the battery" and "the thermal energy developed" represent two names of the same physical quantity?
What should be the value of R in the figure. for which the current in it is zero?
A parallel-plate capacitor is filled with a dielectric material of resistivity ρ and dielectric constant K. The capacitor is charged and disconnected from the charging source. The capacitor is slowly discharged through the dielectric. Show that the time constant of the discharge is independent of all geometrical parameters like the plate area or separation between the plates. Find this time constant.
How many time constants will elapse before the power delivered by a battery drops to half of its maximum value in an RC circuit?
A capacitance C charged to a potential difference V is discharged by connecting its plates through a resistance R. Find the heat dissipated in one time constant after the connections are made. Do this by calculating $\int\text{i}^2\text{R}$ dt and also by finding the decrease in the energy stored in the capacitor.
View full solution →How many time constants will elapse before the current in a charging RC circuit drops to half of its initial value? Answer the same question for a discharging RC circuit.
A capacitor of capacitance $10\mu\text{F}$ is connected across a battery of emf 6.0V through a resistance of $20\text{k}\Omega$ for 4.0s. The battery is then replaced by a thick wire. What will be the charge on the capacitor 4.0s after the battery is disconnected?
View full solution →What length of a copper wire of cross-sectional area $0.01mm^2$ will be needed to prepare a resistance of $1\text{k}\Omega?$ Resistivity of copper $=1.7\times10^{-8}\Omega\text{-m}.$
View full solution →How many time constants will elapse before the energy stored in the capacitor reaches half of its equilibrium value in a charging RC circuit?
Find the potential difference between the points A and B and between the points B and C of the figure. in steady state.
Calculate the electric field in a copper wire of cross-sectional area $2.0mm^2$ carrying a current of 1A.
The resistivity of copper $=1.7\times10^{-8}\Omega\text{-m}.$
View full solution →The resistivity of copper $=1.7\times10^{-8}\Omega\text{-m}.$
The amount of charge that passes in time t through a cross-section of a wire is,
$Q(t) = At^2 + Bt + C.$
View full solution →$Q(t) = At^2 + Bt + C.$
- Write the dimensional formulae for A, B and C.
- If the numerical values of A, B and C are 5, 3 and 1, respectively, in S.I units, find the value of the current at t = 5s.
The plates of a capacitor of capacitance $10\mu\text{F},$ charged to $60\mu\text{C},$ are joined together by a wire of resistance $10\Omega$ at t = 0. Find the charge on the capacitor in the circuit at (a) t = 0 (b) $\text{t}=30\mu\text{s}$ (c) $\text{t}=120\mu\text{s}$ and (d) t = 1.0ms.
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