BPSC CCE Prelims
Magnetism Previous Year Questions (PYQs)
Practice solved questions for Magnetism with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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Which of the following is equivalent to tesla?
Detailed Explanation:
Tesla (T) is the SI unit of magnetic flux density. From the Lorentz force equation for a current-carrying conductor: F = I ℓ B, rearranging gives B = F / (I ℓ).
Therefore, 1 Tesla = 1 Newton / (Ampere × meter), which matches Option 4: Newton per ampere meter.
The paramagnetic theory of magnetism applies to
Detailed Explanation:
Paramagnetic substances are weakly attracted by magnetic fields and have small positive susceptibility (χ > 0). Among the options, platinum is a classic paramagnetic material with unpaired electrons that align weakly with external magnetic fields.
Iron and nickel are ferromagnetic (strongly magnetic, χ >> 1000), while mercury is diamagnetic (weakly repelled, χ < 0). Other paramagnetic examples include aluminium and manganese.
Therefore, only platinum exhibits paramagnetic behavior, making Option 3 the correct answer.
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