Q86 / 100 · BITSAT 2022 · Physics

An electromagnetic wave is propagating along $X$-axis. At $x=1 \mathrm{~cm}$ and $t=18 \mathrm{~s}$, its electric vector $|E|=8 \mathrm{~V} / \mathrm{m}$, then the magnitude of its magnetic vector is

  • Correct answer
    A
    $266 \times 10^{-8}$
  • B
    $3 \times 10^{-7}$
  • C
    $3.14 \times 10^{-8}$
  • D
    $3.16 \times 10^{-7}$

Solution

As we know that, $\frac{E}{B}=c$ $$ \text { so, } B=\frac{E}{c}=\frac{8}{3 \times 10^8}=2.66 \times 10^{-8} $$

Hence, the correct answer is option: 'A'.

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