Did you know?
A bolt of lightning heats the surrounding air to ~30,000 K — five times hotter than the Sun's surface.
Did you know?
A bolt of lightning heats the surrounding air to ~30,000 K — five times hotter than the Sun's surface.
A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is I. Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of ‘n’ 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:• Total resistance in series (internal resistance)• Current drawn in series 2. Parallel Connection:• Total resistance in parallel • Total resistance including internal resistance • 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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