GATE Questions & Answers of Magnetomotive force

What is the Weightage of Magnetomotive force in GATE Exam?

Total 2 Questions have been asked from Magnetomotive force topic of Electromagnetic Fields subject in previous GATE papers. Average marks 1.50.

The magnitude of magnetic flux density (B) in micro Teslas (µT), at the center of a loop of wire wound as a regular hexagon of side length 1 m carrying a current (I=1 A), and placed in vacuum as shown in the figure is ___________. (Give the answer up to two decimal places.)

 

Consider a one-turn rectangular loop of wire place in a uniform magnetic field as shown in the figure. The plane of the loop is perpendicular to the field lines. The resistance of the loop is 0.4Ω, and its inductance is negligible. The magnetic flux density (in Tesla) is a function of time, and is given by Bt=0.25 sinωt, where ω =2π×50 radian/second. The power absorbed ( in Watt) by the loop from the magnetic field is __________.