A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time, electric field is $\vec{E} = 6.3 \hat{j} V / m$ . Strength of the magnetic field at this point

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

$- 2.1 \times 10^{- 8} \hat{k} T$

$2.1 \times 10^{- 8} \hat{k} T$

$2.1 \times 10^{- 8} \hat{i} T$

$2.1 \times 10^{- 8} \hat{j} T$

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Given
Frequency of electro magnetic wave= $25 MHz = 25 \times 10^{6} Hz$

Electric field $\vec{E} = 6.3 \hat{j} V / m$

$c = \frac{E}{B} \Rightarrow B = \frac{E}{c} = \frac{6.3}{3 \times 10^{8}} = 2.1 \times 10^{- 8} T$

Also velocity of EMW is along $\vec{E} \times \vec{B}$ , so direction of magnetic field is given by $\vec{v} \times \vec{E} = (\hat{i} \times \hat{j}) = \hat{k}$

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Get Expert Academic Guidance – Connect with a Counselor Today!