Did you know?
Absolute zero (โ273.15ยฐC) is the coldest possible temperature โ at which atoms nearly stop moving.
Did you know?
Absolute zero (โ273.15ยฐC) is the coldest possible temperature โ at which atoms nearly stop moving.
A set of โnโ equal resistors, of value โRโ each, are connected in series to a battery of emf โEโ and internal resistance โRโ. The current drawn is I. Now, the โnโ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of โnโ is:
To solve this problem, we need to analyze the two scenarios: when the resistors are connected in series and when they are connected in parallel.1. Series Connection:โข Total resistance in series (internal resistance)โข Current drawn in series 2. Parallel Connection:โข Total resistance in parallel โข Total resistance including internal resistance โข Current drawn in parallel According to the problem, the current in parallel is 10 times the current in series:Substitute the expressions for and Cancel from both sides:Cross-multiply to solve for Multiply through by to eliminate the fraction:Rearrange terms:Factor out Since solve the quadratic equation:Use the quadratic formula:Here, This gives two solutions:andSince must be positive, we have Therefore, the value of is This corresponds to Option 3.
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