Question

The electric fields part of an electromagnetic wave I vacuum is E=3.1 $\mathrm { C } ^ { - 1 }$ $\cos\left\lbrack (1.8radm^{- 1})y + (5.4 \times 18^{8}rads^{- 1})t \right\rbrack\widehat{i}$, the amplitude of magnetic field part of the given wave is :

• A. $2 \times 10^{- 8}T$
• B. $1.03 \times 10^{- 8}T$
• C. $4.22 \times 10^{- 8}T$
• D. $5 \times 10^{- 8}T$

Answer 1

Answer: (B)

$1.03 \times 10^{- 8}T$

Answer 2

: Comparing equation (i) and (ii) we get

}{\therefore B_{0} = \frac{E_{0}}{c} = \frac{3.1}{3 \times 10^{8}} = 1.03 \times 10^{- 8}T}$$