Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Waves

Question:

The average electric field of electromagnetic waves in certain region of free space is $9 × 10^{–4} NC^{–1}$. Then the average magnetic field in the same region is

Options:

$27×10^{-4}T$

$3×10^{-12}T$

$\left(\frac{1}{3}\right)×10^{-12}T$

$3×10^{12}T$

Correct Answer:

$3×10^{-12}T$

Explanation:

The correct answer is option (2) : $3×10^{-12}T$

$C=\frac{E_{avg}}{B_{avg}}$

$⇒B_{avg}=\frac{9×10^{-4}}{3×10^{8}}=3×10^{-12}T$