Indian Navy SSR (Sailor) Magnetic Effects of Electric Current — practice questions

Explore 2 free Magnetic Effects of Electric Current questions in Indian Navy SSR (Sailor) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetic Effects of Electric Current questions and exercises with answers

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Magnetic field lines around a straight current-carrying wire are:Read the answer and worked solution →What energy conversion does an electric motor perform?Read the answer and worked solution →

Worked practice questions

Magnetic field lines around a straight current-carrying wire are:

Straight lines parallel to the wire
Concentric circles around the wire
Random and disordered
Radial lines pointing outward

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Correct answer: B. Concentric circles around the wire

1. A straight current-carrying conductor produces a magnetic field in the surrounding space. 2. Iron filings sprinkled around the wire arrange themselves in concentric circles. 3. The centre of each circle lies on the wire itself. 4. So the field lines form concentric circles around the wire. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_

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What energy conversion does an electric motor perform?

Mechanical to electrical
Chemical to electrical
Electrical to heat
Electrical to mechanical

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Correct answer: D. Electrical to mechanical

1. An electric motor converts input electrical energy into rotational mechanical energy. 2. A current through the armature in a magnetic field produces a torque. 3. The torque turns the rotor, driving a mechanical load. 4. So motors convert electrical energy to mechanical energy. 5. The opposite conversion is done by an electric generator. _Source: syllabus Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_