There are two possible choices for the direction of , \widehat{n} the vector normal to the detector coil plane. the magnetic flux depends on the dot product {\overrightarrow{b}}\cdot \widehat{n} , so the sign of the flux depends on the direction chosen for \widehat{n}. does the choice matter? if so, how do you decide which one to use?

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?