Week 5

Week 5

The midterm will include all material up to and including the material covered on Friday Feb 6th.
i.e. Chapters 42, 21, 22 and 23.

In Chapter 23:
omit Examples 23-8 and 23-9
I will come back to section 23-6 electric dipoles

Answers to MT1 00W
Question 1
a) (-1.69i + 4.19 j -5.00k)x10⁵ N/C
b) |q₁/q₂| = 10/7
c) -6.79x10⁵ C, 1.33x10^-9 C/m²

Question 2
a) 3.66x10⁴ Bq, 0.979
b) beta plus, 2.99 MeV

Question 3

a) (12.4i+0.3j)x10⁵ N/C
b) - 0.20 m

Question 4
a) yes mass( reactants-products) =0.000101 u, no delta m= - 0.007806
b) 5, 2

Answers to MT1 01W

Question 1
a) 0.05m 0.05m, 100kq² j, 400kqi, kq(-35.1i+71.6j), kq(35.1i-71.6j), 400kqi
b) 5.0x10^-5J

Question 2
a) stable Li-7 and Be-9
b) 193.5 MeV, 4.64x10¹⁰, 3.77x10⁵ Bq, 5.38 l

Question 3
a) +3Q, +2Q, E=0, E= 3kQ/r² radially in, E=0, E= 2kQ/r² radially out
b) Same potential or E=0 inside metal, all charge on outside

Answers to in class examples
23.1 a) 1.6x10^-16 J, b) 4.4x10⁵ m/s c) 1.87x10⁷ m/s
23.2 a) 360000V, b) -360000V c) same as a), d) 180000V (i.e.inside shell)
23.3 -4495V

Review 1
a) 2.54N i +0.74N j b) -1.27x10^-6N/Ci - 0.37x10^-6N/C j
c) -1.65x10⁵ V, d) -0.03J