A closely wound, circular coil with radius 2.40 cm has 800 turns. (a) What must the current in the coil be if the magnetic field at the center of the coil is 0.0770 T? (b) At what distance x from the center of the coil, on the axis of the coil, is the magnetic field half its value at the center?

What is the magnitude of the magnetic flux (Pinitial) through the coil before it is rotated? Express your answer numerically, in webers, to at least three significant figures. In a physics laboratory experiment, a coil with 250 turns enclosing an area of 13.1 cm? is rotated during the time interval 3.80x10-2 s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.00x10-5 T. • View Available Hint(s) V ΑΣφ ? |Pinitial| = Wb Submit Part B What is the magnitude of the magnetic flux Pfinal through the coil after it is rotated? Express your answer numerically, in webers, to at least three significant figures. • View Available Hint(s) ΑΣφ |Pfinal| = Wb 圓

A circular loop of radius 12.4 cm is placed in a uniform magnetic field. (a) If the field is directed perpendicular to the plane of the loop and the magnetic flux through the loop is 8.50 ✕ 10−3 T · m2, what is the strength of the magnetic field? T(b) If the magnetic field is directed parallel to the plane of the loop, what is the magnetic flux through the loop? T · m2

What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N ⋅ m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?