Question
The potential difference between the terminals of a 6.0V battery is 7.2V when it is being charged by a current of 2.0A. What is the internal resistance of the battery?
✓
Answer
$\text{V}=\epsilon+\text{ir}$$\Rightarrow7.2=6+2\times\text{r}$
$\Rightarrow1.2=2\text{r}\Rightarrow\text{r}=0.6\Omega.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Briefly explain about light.
Suppose the platform of the previous problem is brought to rest with the ball in the hand of the kid standing on the rim. The kid throws the ball horizontally to his friend in a direction tangential to the rim with a speed v as seen by his friend. Find the angular velocity with which the platform will start rotating.
Write the important points for series connection of cells.
An inductor-coil carries a steady-state current of 2.0A when connected across an ideal battery of emf 4.0V. If its inductance is 1.0H, find the time constant of the circuit.
Let I = current through a conductor, R = its resistance and V = potential difference across its ends. According to Ohm's law, product of two of these quantities equals the third. Obtain Ohm's law from dimensional analysis. Dimensional formulae for R and V are $\text{ML}^2\text{I}^{-2}\text{T}^{-3}$ and $\text{ML}^2\text{T}^{-3}\text{I}^{-1}$ respectively.
→Unpolarised light is passed through a polaroid $P_1.$ When this polarised beam passes through another polaroid $P_2$ and if the pass axis of $P_2$ makes angle $\theta$ with the pass axis of $P_1,$ then write the expression for the polarised beam passing through $P_2.$ Draw a plot showing the variation of intensity when $\theta$ varies from $0$ to $2\pi.$
→Explain ground state and ionisation energy of hydrogen atom.
Three capacitors are arranged as shown in the circuit diagram. If the total capacitance between points A and B is $3 \mu F$, then the value of capacitance of X capacitor will be.
→Explain the structure of Polaroid.
A gas thermometer measures the temperature from the variation of pressure of a sample of gas. If the pressure measured at the melting point of lead is $2.20$ times the pressure measured at the triple point of water, find the melting point of lead.
→