Question:
In electro magnetism, the source of magnetic field is
In electro magnetism, the source of magnetic field is
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Electromagnetism Fundamentals: Magnetic fields are produced by CURRENT LOOPS MOVING CHARGES. Static charges produce only electric fields. Magnetic monopoles do not exist.
Updated On: Sep 15, 2026
- An isolated magnetic pole
- Static electric charge
- Magnetic substances
- Current loop
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Classical electrodynamics and Biot-Savart Ampere's Law: static charges generate only electric fields; magnetic fields are produced exclusively by moving electric charges, electric currents, or a closed Current Loop (magnetic dipole).
Key Formula or Approach:
\[ \mathbf{B} = \frac{\mu_0}{4\pi} \oint \frac{I \, d\mathbf{l} \times \hat{\mathbf{r}}}{r^2} \quad \implies \quad \mathbf{Current \text{ } Loop \text{ (Moving Electric Charges)} \equiv Source \text{ } of \text{ } Magnetic \text{ } Field} \]
Step 2: Detailed Explanation:
In electromagnetism, electrical machines, and electromagnetic sensors:
1. Static Electric Charge (B): Generates solely an electrostatic field (Coulomb's Law, $\nabla \cdot \mathbf{E} = \rho/\epsilon_0$).
2. Isolated Magnetic Monopole (A): Does not exist in nature (Gauss's Law for Magnetism, $\nabla \cdot \mathbf{B} = 0$).
3. Current Loop Moving Charges (D): According to Oersted's discovery, Ampere's circuital law, and the Biot-Savart law, moving electric charges an electric current circulating in a closed loop (Current Loop) generate a magnetic field ($\mathbf{B}$) with closed continuous magnetic flux lines.
Step 3: Final Answer:
Hence, the source of magnetic field in electromagnetism is Current loop, matching option (D).
Classical electrodynamics and Biot-Savart Ampere's Law: static charges generate only electric fields; magnetic fields are produced exclusively by moving electric charges, electric currents, or a closed Current Loop (magnetic dipole).
Key Formula or Approach:
\[ \mathbf{B} = \frac{\mu_0}{4\pi} \oint \frac{I \, d\mathbf{l} \times \hat{\mathbf{r}}}{r^2} \quad \implies \quad \mathbf{Current \text{ } Loop \text{ (Moving Electric Charges)} \equiv Source \text{ } of \text{ } Magnetic \text{ } Field} \]
Step 2: Detailed Explanation:
In electromagnetism, electrical machines, and electromagnetic sensors:
1. Static Electric Charge (B): Generates solely an electrostatic field (Coulomb's Law, $\nabla \cdot \mathbf{E} = \rho/\epsilon_0$).
2. Isolated Magnetic Monopole (A): Does not exist in nature (Gauss's Law for Magnetism, $\nabla \cdot \mathbf{B} = 0$).
3. Current Loop Moving Charges (D): According to Oersted's discovery, Ampere's circuital law, and the Biot-Savart law, moving electric charges an electric current circulating in a closed loop (Current Loop) generate a magnetic field ($\mathbf{B}$) with closed continuous magnetic flux lines.
Step 3: Final Answer:
Hence, the source of magnetic field in electromagnetism is Current loop, matching option (D).
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