General Physics II Test-1 Thursday Feb. 22nd, 2018 Name:le ome ID: INSTRUCTIONS

Question

General Physics II Test-1 Thursday Feb. 22nd, 2018 Name:le ome ID: INSTRUCTIONS 1) No Cell Phone and No Communication 1. A repelling force must occur between two charged objects under which conditions? a. charges are of unlike signs b. charges are of like signs c. charges are of equal magnitude d. charges are of unequal magnitude A metallic object holds a charge of-3.8 × 10-6 c. what total number of electrons does this represent? (e 1.6 x 10-19 C is the magnitude of the electronic charge.) 2. a. 4.2 x 104 b. 6.1 x 1013 c. 2.4 x 101 d. 1.6 x 1014 3. Which of the following best characterizes electrical insulators? a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors

Explanation / Answer

only one question can be posted as per chegg guidelines

1.

answer is b)Charges are of like signs

Since like charges repel each other and unlike charges attract each other.

2.

Total Number of electrons is given by

N=Q/e =(-3.8*10-6)/(-1.6*10-19)

N=2.4*1013 electrons

Answer is C

3.

answer is a) Charges on the surface dont move

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