Asmall glass bead has been charged to 7.6 nc. what is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4πε 0 = 8.99 × 109 n · m2/c2)

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?

Mixing salt in water is an example of physical change

What do we mean by the event horizon of a black hole?