If an object has a net positive charge of 4.0 coulombs, the object possesses (1) 6.3 × 10^18 more electrons than protons (2) 2.5 × 10^19 more electrons than protons (3) 6.3 × 10^18 more protons than electrons (4) 2.5 × 10^19 more protons than electrons

(4) more protons than electrons

Explanation:

Total positive change on the object is given as

now by the law of quantization of charge we know that the charge on any body is always in form of integral multiple of charge of an electron.

So we will have

here we know that

Now we know that the object is positively charged so here electrons must be less in numbers than protons

so correct answer will be

(4) more protons than electrons

(a)

(b) I = 1.65*10^-4 A

Explanation:

(a) To find the induced emf in the coil you use the following formula:

          (1)

N: turns = 560

ФB: magnetic flux = AB

A: area = π r^2 = π (0.0415m)^2 = 5.41*10^-3 m^2

you replace the expression for the magnetic flux in the equation (1). Next, you derivative the magnetic field respect to time. Finally,  you replace t=5.00s:

(b) The current is given by: