Part A Light bulbs are typically rated by their power dissipation when operated

ID: 1567096 • Letter: P

Question

Part A

Light bulbs are typically rated by their power dissipation when operated at a given voltage.

Which of the following light bulbs has the largest resistance when operated at the voltage for which it's rated?

A. 6.4 W , 12 V

B. 48 W , 24 V

C. 32 W , 36 V

D. 64 W , 48 V

Part B

Light bulbs are typically rated by their power dissipation when operated at a given voltage.

Which of the following light bulbs has the largest current through it when operated at the voltage for which it's rated?

A. 4.0 W , 7.5 V

B. 30 W , 15 V

C. 20 W , 23 V

D. 40 W , 30 V

Part C

A + 7.4 nC point charge and a - 2.9 nC point charge are 3.4 cm apart. What is the electric field strength at the midpoint between the two charges?

A. 1.6×105 N/C

B. 2100 N/C

C. 6400 N/C

D. 3.2×105 N/C

Part D

The main difference between conductors and insulators is in terms of

A. protons. B. neutrons. C, conduction electrons. D. atoms. E. None of the other choices is correct

electric field is given by:

E = k*q/r^2

Enet = E1 + E2

Enet = k*q1/r1^2 + k*q2/r2^2

Enet = 9*10^9*(7.4*10^-9/0.017^2 + 2.9*10^-9/0.017^2)

Enet = 320761 N/C = 3.2*10^5 N/C

Correct option is D.

difference between conductors and insulators is that conductors have conduction electrons.

Correct option is C.