answer no. 2 only What Have I Learned So Far?So1. A +7.7 × 104-C charge is uniformly distributed around a thin insulating ring with aradius of 0.48 m. It rotates with a speed of 7 500 rad/s on its axis perpendicular tothe plane of the ring and passing through its center. What is the magnitude of themagnetic field generated at the center of the ring?2. Two circular coils are concentric and lie on the same plane. The inner coil has 100 turnsof wire, has a radius of 0.011 m, and has a current of 4.6 A. The outer coil has 150 turnsand has a diameter of 0.200 m. Determine the magnitude and direction of the currentin the outer coil for the net magnetic field at the center of the coils to be equal to zero.3. A 20-uCcharge travels at a speed of 4.55 x 10 m/s perpendicular to a uniform magneticfield. This charge experiences a magnetic force of 8.35 x 10-5 N. Simultaneously, a10-uC charge travels at an angle of 45° with respect to the same magnetic field andexperiences a force of 1.01 x 10-4N. What is the speed of the 10-µC charge?4. Consider two concentric coils that are lying on the same plane. Suppose the inner coilhas 110 turns of wire, has a radius of 0.02 m, and has a current of 3.0 A. The outer coilhas 200 turns and has a radius of 0.10 m. What should be the magnitude and directionof the current in the inner coil so that the magnetic field at the center of the two coilswill be equal to zero?Magnetic Field for Highly Symmetric Current

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magnetic field generated at the center of the ring! 2. Two circular coils are concentric and lie on the same plane. The inner coil has 100 turns of wire, has a radius of 0.011 m, and has a current of 4.6 A. The outer coil has 150 turns and has a diameter of 0.200 m. Determine the magnitude and direction of the current in the outer coil for the net magnetic field at the center of the coils to be equal to zero.