A particle travelling at 7.20 × 106 m/s enters a region of magnetic field with direction as shown above. The particle is deflected and follows the path shown. If the particle spends 6.50 ns in the region before exiting again, what is the magnitude of the magnetic field?

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

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