Question 1:

A circular coil has a radius of r= 9.8 cm and is made by winding wire around with N= 30 turns. The coil is placed in a magnetic field that is perpendicular to the plane of the coil. The magnetic field varies with time according to this function: B(t) = 0.05t* + 0.1t + 0.09 T. Find the induced EMF in the coil when t= 6 seconds The induced EMF is equal to ?A wire is bent into a semi-circle as shown here. The semicircle has a radius of r: 0.8 m. The crank is turned. causing the semicircle to rotate in a constant magnetic field, which is into the page. The cranI-c is turned at an angular speed of E revsisecond and the magnetic field has strength B: [M- Tesla. Find the amplitude of the EMF induced in the semicircle. The maximum induced EMF is equal to C] ? V A solenoid of length 55 Cm has 400 turns of radius 2.5 Cm. An outer coil with 8 turns of radius 4'6 Cm is placed around the solenoid. The axes of the coil and solenoid coincide. Find the emf induced in the coil ifthe current in the solenoid varies according to I = 3.4sn(407r) A. , lJeosL'lm] mV