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For a given electromagnetic wave the magnitude of electric field is 6.6 V m⁻¹ at a point in space. The magnitude of magnetic field at this point is ______ T.

Asked in GSEB Board March 2023 · Writing B from E, and E from B

• (1) 2.1×10⁻⁸
• (2) 6.6×10⁻⁸
• (3) 19.8×10⁻⁸
• (4) 2.2×10⁻⁸

Step-by-step solution

Why the other options are wrong

• (1) 2.1×10⁻⁸ is the field that goes with 6.3 V m⁻¹; dividing 6.6 by 3×10⁸ gives 2.2×10⁻⁸, not 2.1×10⁻⁸.
• (2) comes from attaches 10⁻⁸ to the given number without dividing by the 3 in c at all.
• (3) comes from multiplying by 3 instead of dividing: 6.6×3=19.8.

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