6 Several electrons move at speed 6.80 x 10 m/s in a uniform magnetic field with magnitude B= 0.510 T directed downward. Find the magnetic force on the electron at point c. Enter a positive value if the direction of magnetic force is out of the page and enter a negative value if the direction of magnetic force is in to the page. d 20.0% 20,0 B 30.0 N7 An electron moves at speed 9.30 x 10 m/s in a plane perpendicular to a cyclotron's magnetic field. The magnitude of the magnetic force on the electron is 1.20 x 10-13 N. What is the magnitude of the magnetic field?cm. When 2.00 A of current flows through the solenoid, the magnetic field inside the iron core has magnitude 0.670 T. What is the 9 An electromagnet is made by inserting a soft iron core into a solenoid. The solenoid has 1800 turns, radius 2.00 cm, and length 20.9 relative permeability KB of the iron core? 10 The ions entering the mass spectrometer have the same charges. After being accelerated through a potential difference of1.90 W, a singly charged 12C+ ion moves in a circle of radius 20.7 cm in the magnetic field ofa mass spectrometer. What is the magnitude ofthe field? Use these atomic mass values: 12C, 12.0 u;14C,14.O u; 16'0, 15.99 u. The conversion between atomic mass units and kilograms is 1u = 1.66 x1047 kg. T