Question:medium

In a loop, EMF \(= 10\,\text{V}\) and total resistance \(= 5\,\Omega\). Current in circuit is:

Show Hint

For a single-loop circuit, always remember that the current remains constant at every point in the loop, and can be found by dividing the net EMF by the net series resistance.
Updated On: Jun 3, 2026
  • $1\text{ A}$
  • $2\text{ A}$
  • $5\text{ A}$
  • $10\text{ A}$
Show Solution

The Correct Option is B

Solution and Explanation

Step 1: Understanding the Concept:
This problem deals with basic DC circuit analysis using Ohm's Law and the concept of Electromotive Force (EMF).
Electromotive Force is not a force in the mechanical sense; it is the energy provided per unit charge by a source (like a battery) to move charges around a complete circuit loop.
Ohm's Law provides the empirical relationship between the voltage across a conductor and the resulting electric current through it, given a constant resistance.
In a simple single-loop circuit, the total EMF drives the current through the total equivalent resistance of the path.
Step 2: Key Formula or Approach:
According to Ohm's Law (or Kirchhoff's Loop Rule for a single loop):
\[ I = \frac{E}{R_{\text{total}}} \]
Where:
\( I \) is the steady-state current in Amperes (A).
\( E \) is the total Electromotive Force in Volts (V).
\( R_{\text{total}} \) is the sum of all resistances in the loop, including internal resistance if mentioned.
Step 3: Detailed Explanation:
Given Parameters:
Total EMF of the source = 10 V.
Total loop resistance = \( 5 \Omega \).
The question implies that \( 5 \Omega \) is the aggregate resistance (the sum of any external resistors and the internal resistance of the battery).
Substituting the values into the algebraic relationship:
\[ I = \frac{10 \text{ V}}{5 \Omega} \]
\[ I = 2 \text{ A} \]
This means that every second, 2 Coulombs of electric charge pass through any given cross-section of the wire in the loop.
Since it is a single closed loop, the current is uniform throughout the entire circuit.
No charge is "consumed" as it flows; the energy provided by the EMF is simply dissipated as heat in the resistance according to Joule's heating law (\( P = I^{2}R \)).
Step 4: Final Answer:
The electric current flowing through the circuit loop is 2 A.
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