Question
Four identical cells, each having an emf of 1.8 V,
are linked in parallel and connected to an external network made of two resistors of 10 Ω each arranged in parallel. If the potential difference across the output terminals is measured to be 1.5 V by an ideal voltmeter, what is the internal resistance of each cell?Solution
When multiple identical cells are joined in parallel, the net emf remains the same as that of a single cell. Hence,
Total emf (E) = 1.8 V Let r be the internal resistance of each cell. Since the cells are in parallel, their effective internal resistance is reduced: 
Now, calculate the combined resistance of the external circuit: Two 10 Ω resistors in parallel: 
Using Ohm’s law: 
The potential drop inside the battery system due to internal resistance is: 
The meeting has been postponed and will be rescheduled at a later date.
In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followe...
A callous system generates nothing but a misanthrope.
I. Without a global efforts to rapidly reduce greenhouse gas emissions, average global temperatures are very likely to exceed 2°C even with current po...
There was nothing very cheerful in the climate or the town, and though there was an air of cheerfulness abroad.
Improve the bold part of the sentence. Choose ‘No improvement’ as an answer if the sentence is grammatically correct.
A man may die, na...
Select the alternative that will improve the bold part of the sentence in case there is no improvement select “No improvement”.
Ajit has b...
There were significant factors responsible for the farmers’ victory apart from the well-known political reasons for which the farm laws were repealed....
In the questions given below, a part of the sentence is given in bold. Below each sentence, some phrases are given which can substitute the bold part ...
In each of the following questions, a part of the sentence is bold. Below the sentence are given alternatives to the bold part which may improve the se...
Relevant for Exams:
