In an apparatus, the electric field was found to oscillate with an amplitude of 18 V/m. The magnitude of the oscillating magnetic field will be

4 × 10−6 T 6 × 10−8 T 9 × 10−9 T 11 × 10−11 T

6 × 10−8 T

$B_0=\frac{E_0}{c}=6 \times 10^{-8}$ T ∴ (B)