AP EAPCET 05-Jul-2022 Shift 2 Paper

Frequency of EM wave, f=50‌MHz
=5×107‌Hz
In free space, the energy density of a static electric field,
KE=‌

1

2

ε0E2 ........(i)
Again, in free space, the energy density of a static magnetic field,
KB=‌

B2

2µ0

=‌

( E c )2

2µ0

(∴B=‌

E

c

)
=‌

E2

2c2µ0

=‌

E2

2‌ 1 µ0ε0 µ0

‌‌(∵c2=‌

1

µ0ε0

)
=‌

1

2

ε0E2
[From Eq. (i)]
‌=KE
∴‌‌KE‌=KB