(20) Problem 3: As shown, a conducting rod slides across parallel conducting rails connected at one end by a conducting wire, completing a rectangular circuit with dimensions a x 4.0 cm that is in the plane of the screen. All of these components are composed of metal that has a resistance per unit length of 2.8 4/cm. The rod moves towards the left at a constant speed of 2.25 m/s. A magnetic 0.75 T is perpendicular to and directed out of the screen, 4.0 cm D A 25% Part (a) What is the the magnitude, in amperes, of the current in the circuit when the length a = 8.0 cm? Grade Summary Deductions Potential 100 4 " sin() coal tand 7 9 Submissions Allempts remaining gotan() using (0 per stiempi) atan sinh() 2 detailed when cosh() tanb() golanho Degrees O Radians Submit I give up Hints Feedback: deduction per feedback. Submission History Date Time Hints Feedback 4 25% Part (b) What is the current in amperes in the circuit when a = 4:25 cm