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While doing an experiment Neeraj fixed a...

While doing an experiment Neeraj fixed a sheet of white paper on a drawing board. He placed a bar magnet in the centre of it. He sprinkled some iron filings uniformly around the bar magnet. Then he tapped the board gently and observed that the iron filings arranged themselves in a particular pattern.
Which of these is not a source of magnetic field?

A

Magnet

B

Moving charges

C

Electric current

D

Battery

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to identify which of the given options is not a source of a magnetic field. Let's break down the thought process step by step: ### Step 1: Understanding the Sources of Magnetic Fields A magnetic field can be generated by certain sources. The common sources include: - Permanent magnets (like bar magnets) - Moving electric charges (like electrons in motion) - Electric currents (flow of electric charge through a conductor) ### Step 2: Analyzing the Experiment In Neeraj's experiment, he used a bar magnet, which is a known source of a magnetic field. The iron filings arranged themselves along the magnetic field lines created by the bar magnet. This indicates that the bar magnet is indeed a source of the magnetic field. ### Step 3: Evaluating Other Possible Sources - **Moving Charges**: When charges move, they create a magnetic field. This is a fundamental principle of electromagnetism. - **Electric Current**: When electric current flows through a conductor, it generates a magnetic field around it. ### Step 4: Identifying the Non-Source Now, we need to consider the option that does not generate a magnetic field. A battery, when not connected in a circuit, does not produce a magnetic field. It is only when the battery is part of a closed circuit that it allows current to flow, which in turn creates a magnetic field. ### Conclusion From the analysis, the option that is not a source of a magnetic field is **a battery (when not connected in a circuit)**. ### Final Answer **A battery (when not connected in a circuit) is not a source of magnetic field.** ---
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