1) A proton (p) and electron (e-) are released when they are 4 Å (4 Angstroms). Find the initial accelerations of each particle, from one of the selections below. a) a(p) = 8.63 x 1017 m/s2, a(e-) = 1.58 x 1021 m/s2; b) a(p) = 3.4 x 1018 m/s2, a(e-) = 6.3 x 1021 m/s2; c) a(p) = 4.315 x 1016 m/s2, a(e-) = 7.9 x 1020 m/s2; d) a(p) = 3.45 x 1018 m/s2, a(e-) = 6.32 x 1021 m/s2.
1) A proton (p) and electron (e-) are released when they are 4 Å (4 Angstroms). Find the initial accelerations of each particle, from one of the selections below.
a) a(p) = 8.63 x 1017 m/s2, a(e-) = 1.58 x 1021 m/s2;
b) a(p) = 3.4 x 1018 m/s2, a(e-) = 6.3 x 1021 m/s2;
c) a(p) = 4.315 x 1016 m/s2, a(e-) = 7.9 x 1020 m/s2;
d) a(p) = 3.45 x 1018 m/s2, a(e-) = 6.32 x 1021 m/s2.
1) Two small spheres are placed a distance 20 cm apart and have equal charge. How many excess electrons must be placed on each sphere if the magnitude of the Coulomb repulsive force is F = 3.33 x 10-21 N?
a) 2 x 103;
b) 350;
c) 760;
d) 1.2 x 103.
3）Three individual point charges are placed at the following positions in the x-y plane:
Q3 = 5.0 nC at (x, y) = (0,0);
Q2 = -3.0 nC at (x, y) = (4 cm, 0);
and Q1 = ? nC at (x, y) = (2 cm,0);
What is the magnitude, and sign, of charge Q1 such that the net force exerted on charge Q3, exerted by charges Q1 and Q2, is zero?
a) Q1 = + 0.5 nC;
b) Q1 = - 0.25 nC;
c) Q1 = + 0.375 nC;
d) Q1 = + 0.750 nC.
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