Question

Light wave travelling in air along $x$-direction is given by $E_y=540 \sin \pi \times 10^4(x-c t) Vm ^{-1}$ Then, the peak value of magnetic field of wave will be (Given $c =3 \times 10^8 ms ^{-1}$ )

• A. $18 \times 10^{-7} T$
• B. $54 \times 10^{-7} T$
• C. $54 \times 10^{-8} T$
• D. $18 \times 10^{-8} T$

Answer 1

Answer: (A)

$18 \times 10^{-7} T$

Answer 2

Ey​=540sinπ×104(x−ct)Vm−1
E0​=540Vm−1
B0​=CE0​​=3×108540​=18×10−7T