Physics · Current Electricity

NEET (UG) 2023 — Question 36

10 resistors, each of resistance $R$ are connected in series to a battery of emf $E$ and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased $n$ times. The value of $n$ is :

Option A:
100
Correct
Option B:
1
Option C:
1000
Option D:
10

Answer: A

Step-by-step solution

In series combination

\begin{aligned} & R_{\mathrm{eq}}=10 R \\ & i=\frac{E}{10 R} \end{aligned}

In parallel combination

\begin{aligned} & R_{\text {eq }}=\frac{R}{10} \\ & i^{\prime}=\frac{E}{\frac{R}{10}}=\frac{10 E}{R} \\ & i^{\prime}=10 \times 10 i=100 i \\ & n=100 \end{aligned}

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Exam: NEET (UG) 2023
Paper: 2023 paper
Subject: Physics
Chapter: Current Electricity
Topic: Combination of Resistors and cells, Wheatstone Bridge

Answer: A

Step-by-step solution

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