JEE MAIN - Physics (2019 - 12th January Evening Slot - No. 5)
The mean intensity of radiation on the surface of the Sun is about 108 W/m2 . The rms value of the corresponding magnetic field is closet to :
102 T
10$$-$$2 T
10$$-$$4 T
1 T
Explanation
I = $${\varepsilon _0}\,C\,E_{rms}^2$$
& Erms = cBrms
I = $${\varepsilon _0}$$ C3 B$$_{rms}^2$$
B$$_{rms}$$ = $$\sqrt {{{\rm I} \over {{ \in _0}{C^3}}}} $$
Brms $$ \approx $$ 10$$-$$4
& Erms = cBrms
I = $${\varepsilon _0}$$ C3 B$$_{rms}^2$$
B$$_{rms}$$ = $$\sqrt {{{\rm I} \over {{ \in _0}{C^3}}}} $$
Brms $$ \approx $$ 10$$-$$4
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