Electricity and Magnetism Answers

The Apple states in the Accessory Design Guidelines that with new iPhone 12 models can be used MagSafe magnet accessories. The magnets in those shall be N48H NdFeB with a 7 μm - 13 μm NiCuNi plating finish (or similar) and shall meet the requirements in Table 23-7 (page 90).
Also in the guidelines states that any other magnets accept MagSafe shall be used with iPhones. The question is, how magnet from other materials, like N52H NdFeB can influence on the iPhone, if it will be constantly used in the accessories to iPhone?

Qyestion: https://ibb.co/5v763MK
Answer: lower case gamma = 976

Question: https://ibb.co/gjjB1rs
Answer: https://ibb.co/K276MzX

A spherical Gaussian surface of radius a = 400 cm surrounding a -50 µC charge. Find the
flux through

A free electron and a free proton at exactly 1.0 CM apart. Find the magnitude and direction of the acceleration of the proton and the acceleration of the electron

Determine the magnetic field B at the point (0,0,2) produced by a circular wire of radius r carrying a current I. Assume the wire is positioned in the x-y plane and centred at (0,0,0).
Determine the magnitude and direction of the magnetic field for r = 1 cm and I=1 A

How much work is done to bring two electrons to a distance of 5.3 x 10-11 m to the nucleus of a Helium atom (q = 3.2 x 10-19 C)?

A very thing charged rod is placed along x axis with its midpoint at the origin.The charge per unit length of rod is Lemda c/m,the electric field vector at y=-a on u axis is

If A=10ax-4ay+6az and B=2ax+ay, find a the component of A along ay b the magnitude of 3A-B, c a unit vector along A+2B