Question

A circular coil of wire with radius 2 cm and 60 turns is placed in a uniform magnetic field of magnitude 0.8 T. The magnetic field is parallel to the area vector; i.e. perpendicular to the plane of the coil. a) What is the magnetic flux through the coil? b) The magnetic field is decreased to 0 T in 0.1 s. What is the magnitude of the emf induced in the coil during this time interval? c) If the coil has a resistance per unit length of 2 0/m, how much current flows in the coil during this time interval?

Answer 1

0 20° No of turns of the Coil, N= 60 turns. Angle between à & B magnetic field, B = 0.80T. radius off the circular coil, P=2am Area of the circular coils A=70²= Anx104) uit. (a) Magnetic flux through the coils Ø- ET = BA Cos = BA 0.80X42X10 = 1:0053X103 Wool (Aus) (6) Magnetic flux linkage through the coil, A=NBAGS OF NBA induced inf, e=- -NBA NBA (B2-B;) [60LEXX 104) (-0.8)] -0.6032 v] (Grus Resistance of the coily R = 22/m (22)x(Qar)= Eltx0.02), current flowing in the coil, f-ce (6.9983)={2,4 A] Aus d> TE - On 251322