3. [-/5 Points] DETAILS KATZPSE1 30.P.039.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The magnetic field in a region is given by B = (0.750/ + 0.230j ) T. At some instant, a particle with charge q = 20.0 mc has velocity v = (35.6/ + 107.3j + 44.5k) m/s. What is the magnetic force exerted on the particle at that instant? (Express your answer in vector form.) FB= N Need Help? Master It Submit Answer 4. [-/5 Points] DETAILS KATZPSE1 30.P.047. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A proton is launched with a speed of 2.80 x 106 m/s perpendicular to a uniform magnetic field of 0.310 T in the positive z direction. (a) What is the radius of the circular orbit of the proton? cm (b) What is the frequency of the circular movement of the proton in this field? Hz Submit Answer 5. [-/5 Points] DETAILS KATZPSE1 30.P.051. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A uniform electric field of magnitude 136 kV/m is directed upward in a region of space. A uniform magnetic field of magnitude 0.82 T perpendicular to the electric field also exists in this region. A beam of positively charged particles travels into the region. Determine the speed of the particles at which they will not be deflected by the crossed electric and magnetic fields. (Assume the beam of particles travels perpendicularly to both fields.) m/s Submit