Have a few physics questions from homework I would like to verify with: 1) A cer

Question

Have a few physics questions from homework I would like to verify with:

1) A certain region of space has a uniform electric field of 1.7 N/C. If you put a small sphere of charge 2.6 C in this region, what would the force be on the sphere (in N)?

2) A comb and some hair have opposite charges of 1.4 x 10-5 C. At a distance of 0.39 m, what is the force between them (in N)?

3) Radio station WPHY broadcasts at 93.1 MHz (note: "M" = "mega" = x106). What is the wavelength of the waves it broadcasts?

4) To produce an electric field, an object must have

A. mass.

B. charge.

C. a generator.

D. a high velocity.

E. acceleration.

5) The electric force is?

A. attractive or repulsive.

B. capable of acting through a vacuum.

C. always repulsive.

D. ..More than one of the other answers is correct.

E. always attractive.

6) Which of these materials could not be used as an electric insulator?

A. Wood

B. Sand

C. Plastic

D. Wool

E. Glass

F. Lead

Explanation / Answer

1)

F= qE = 2.6* 1.7 = 4.42 N

2)

force = 9x10^9*1.4x10^-5 *1.4x10^-5 /0.39^2 = 11.6 N

3)
wavelenght L = 3x10^8/ (93.1x10^6) = 3.222 m

4)

B. Charge

5)

A. attractive or repulsive

F.Lead

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.