Air at 200 c blows over a 50 cm x 75 cm plain carbon steel (aisi 1010) hot plate with a constant surface temperature of 2500c. the convection heat transfer coefficient is 25 w/m2k. assume that 300 w is lost from the surface by radiation. calculate the inside plate temperature

An investigator needs a uniform 30 mt field, which she intends to produce with a solenoid. she takes a long 10-cm-diameter tube and wraps wire along the length of it, wrapping 1200 turns of wire along a 75-cm length of the tube. how much current must she pass through the wire to produce the desired field?