The average electric field of electromagnetic waves in certain region of free space is 9 × 10-4 N C -1. Then the average magnetic field in the same region is of the order of

Question

The average electric field of electromagnetic waves in certain region of free space is 9 × 10-4 N C -1. Then the average magnetic field in the same region is of the order of (A) 27 × 10-4 T (B) 3 × 10-12 T (C) ((1/3)) × 10-12 T (D) 3 × 1012 T

Tardigrade Admin · Accepted Answer

E=9 × 10-4 N C -1 For electromagnetic waves, (E/B)=c, speed of light in vacuum. ⇒ (9 × 10-4/B)=3 × 108 m s -1 or B=3 × 10-12 T

Q. The average electric field of electromagnetic waves in certain region of free space is $9 \times 1 0^{- 4} N C^{- 1}$ . Then the average magnetic field in the same region is of the order of

$27 \times 1 0^{- 4} T$

$3 \times 1 0^{- 12} T$

$(\frac{1}{3}) \times 1 0^{- 12} T$

$3 \times 1 0^{12} T$

$E = 9 \times 1 0^{- 4} N C^{- 1}$
For electromagnetic waves, $\frac{E}{B} = c$ , speed of light in vacuum.
$\Rightarrow \frac{9 \times 1 0 ^{- 4}}{B} = 3 \times 1 0^{8} m s^{- 1}$ or $B = 3 \times 1 0^{- 12} T$

Q. The average electric field of electromagnetic waves in certain region of free space is 9×10−4NC−1. Then the average magnetic field in the same region is of the order of

27×10−4T

3×10−12T

(31​)×10−12T

3×1012T