Physics 2 Electric Fields, Circuits, Magnetism

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Adeel Ahmad
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Can someone please help me out with this practice test and provide explanations?
Scanned exam page, Physics C1402 Final Examination Spring 2012, with Problem 1 on a point-like nucleus of charge +Ze surrounded by an electron cloud, a sketch of a sphere with radius R, and Problem 2 showing three charges at the corners of a triangle with a coordinate axis.
Printed exam page with questions on electric fields, potential, and magnetism, including a diagram of a semi-infinite conducting wire inside a cylindrical sheath carrying opposite currents, with radii a, b and c marked.
Scanned homework page with two physics problems: Problem 4 on a neutron star's magnetic field and cyclotron frequency, and Problem 5 with a solenoid and coil diagram labelled I, II, III, a, b and c.
Typed exam problem sheet with circuit diagrams: a 10 V source, switch, 10^3 ohm resistor and 10^-3 H inductor in series; and a transformer with 50 and 1000 turn windings driving a 1000 ohm load.
Homework problem 8 showing a radio transmitter circuit: a capacitor C = 10^-9 F and inductor L = 2.5x10^-3 H in an LC circuit connected to a dipole antenna, with x, y, z axes at right, and parts a) through d) listed below.
Homework problem 9 on polarizers: two polarizers at right angles, with diagrams of unpolarized light of intensity I0 incident on the first polarizer, part a and part b text, and part c with a polarizer at 45 degrees between the others.
Handwritten diagram of a rectangular silicon slab labeled n, with an LED at the bottom center emitting a cone of light upward, the cone angle marked phi, and a label n_air = 1 beneath the slab. Above the diagram is the typed problem 10 text about LED light escape.
Scanned exam page, Physics C1402 Final Examination Spring 2012, with Problem 1 on a point-like nucleus of charge +Ze surrounded by an electron cloud, a sketch of a sphere with radius R, and Problem 2 showing three charges at the corners of a triangle with a coordinate axis.
Printed exam page with questions on electric fields, potential, and magnetism, including a diagram of a semi-infinite conducting wire inside a cylindrical sheath carrying opposite currents, with radii a, b and c marked.
Scanned homework page with two physics problems: Problem 4 on a neutron star's magnetic field and cyclotron frequency, and Problem 5 with a solenoid and coil diagram labelled I, II, III, a, b and c.
Typed exam problem sheet with circuit diagrams: a 10 V source, switch, 10^3 ohm resistor and 10^-3 H inductor in series; and a transformer with 50 and 1000 turn windings driving a 1000 ohm load.
Homework problem 8 showing a radio transmitter circuit: a capacitor C = 10^-9 F and inductor L = 2.5x10^-3 H in an LC circuit connected to a dipole antenna, with x, y, z axes at right, and parts a) through d) listed below.
Homework problem 9 on polarizers: two polarizers at right angles, with diagrams of unpolarized light of intensity I0 incident on the first polarizer, part a and part b text, and part c with a polarizer at 45 degrees between the others.
Handwritten diagram of a rectangular silicon slab labeled n, with an LED at the bottom center emitting a cone of light upward, the cone angle marked phi, and a label n_air = 1 beneath the slab. Above the diagram is the typed problem 10 text about LED light escape.
Scanned exam page, Physics C1402 Final Examination Spring 2012, with Problem 1 on a point-like nucleus of charge +Ze surrounded by an electron cloud, a sketch of a sphere with radius R, and Problem 2 showing three charges at the corners of a triangle with a coordinate axis.
Printed exam page with questions on electric fields, potential, and magnetism, including a diagram of a semi-infinite conducting wire inside a cylindrical sheath carrying opposite currents, with radii a, b and c marked.
Homework problem 8 showing a radio transmitter circuit: a capacitor C = 10^-9 F and inductor L = 2.5x10^-3 H in an LC circuit connected to a dipole antenna, with x, y, z axes at right, and parts a) through d) listed below.
Homework problem 9 on polarizers: two polarizers at right angles, with diagrams of unpolarized light of intensity I0 incident on the first polarizer, part a and part b text, and part c with a polarizer at 45 degrees between the others.
Handwritten diagram of a rectangular silicon slab labeled n, with an LED at the bottom center emitting a cone of light upward, the cone angle marked phi, and a label n_air = 1 beneath the slab. Above the diagram is the typed problem 10 text about LED light escape.
Typed exam problem sheet with circuit diagrams: a 10 V source, switch, 10^3 ohm resistor and 10^-3 H inductor in series; and a transformer with 50 and 1000 turn windings driving a 1000 ohm load.
Scanned homework page with two physics problems: Problem 4 on a neutron star's magnetic field and cyclotron frequency, and Problem 5 with a solenoid and coil diagram labelled I, II, III, a, b and c.

Scanned exam page, Physics C1402 Final Examination Spring 2012, with Problem 1 on a point-like nucleus of charge +Ze surrounded by an electron cloud, a sketch of a sphere with radius R, and Problem 2 showing three charges at the corners of a triangle with a coordinate axis.


Printed exam page with questions on electric fields, potential, and magnetism, including a diagram of a semi-infinite conducting wire inside a cylindrical sheath carrying opposite currents, with radii a, b and c marked.


Scanned homework page with two physics problems: Problem 4 on a neutron star's magnetic field and cyclotron frequency, and Problem 5 with a solenoid and coil diagram labelled I, II, III, a, b and c.

Typed exam problem sheet with circuit diagrams: a 10 V source, switch, 10^3 ohm resistor and 10^-3 H inductor in series; and a transformer with 50 and 1000 turn windings driving a 1000 ohm load.

Homework problem 8 showing a radio transmitter circuit: a capacitor C = 10^-9 F and inductor L = 2.5x10^-3 H in an LC circuit connected to a dipole antenna, with x, y, z axes at right, and parts a) through d) listed below.

Homework problem 9 on polarizers: two polarizers at right angles, with diagrams of unpolarized light of intensity I0 incident on the first polarizer, part a and part b text, and part c with a polarizer at 45 degrees between the others.

Handwritten diagram of a rectangular silicon slab labeled n, with an LED at the bottom center emitting a cone of light upward, the cone angle marked phi, and a label n_air = 1 beneath the slab. Above the diagram is the typed problem 10 text about LED light escape.
 

Discussion

So for number 1 a, when r<R, I take +Ze as q and plug it into the equation E = kq/r2 and get E = kZe/R2. Not sure if that's correct
 
Then for number 1 b when r>R, I assume that E is zero since you set a Gaussian surface that encloses the entire thing so you take the enclosed charge which would be zero since it is +Ze and -Ze which cancels. So when you plug that into solve for E, you would get zero. Please lmk if this is correct.
 

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