Question

A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 Vm⁻¹. The magnetic induction (B) along z-axis is:

Options

• 3.1 × 10⁻⁸ T

• 3 × 10⁻⁵ T

• 3 × 10⁻⁶ T

• 9.3 × 10⁻⁶ T

Answer 1

3.1 × 10⁻⁸ T

Explanation:

Velocity of light

C = ${\displaystyle \frac{\text{E}}{\text{B}}}$

⇒ B = ${\displaystyle \frac{\text{E}}{\text{C}}}$

= ${\displaystyle \frac{9.3}{3\times {10}^8}}$

= 3.1 × 10⁻⁸ T