An electrical charge placed near the insulator will always experience A) attract

Question

An electrical charge placed near the insulator will always experience A) attractive force B) repulsive force C) no force at all D) attractive or repulsive force, which depends on the sign of the charge E) question cannot be answered because not enough is known When starting the engine of a truck, the starter draws from the battery 720 C of charge in 4.00 seconds. How large is the electrical current? A) 180 A B) 360 A. C) 10.5 A D) 1800 A E) None of the above While carrying electrical current metal wires heat up. Which of the following statements are accurate? A) Electric field that makes electrons move also delivers heat to surrounding atoms B) Moving electrons create magnetic field that heats up surrounding atoms C) Collisions between free electrons inside the conductor transfer energy to atoms of the conductor D) Heat is result of electrons having more kinetic energy because the potential difference sets them into motion. E) Statement of the questions is false, metal wires do not heat while carrying electric current A uniform magnetic field of 1T is perpendicular to the plane in which a proton travels with the speed of 3,000 km/s. What is the radius of orbit of a proton? Proton mass, in case you need it, 1.67 times 10^-27 kg A) 1.00 m B) 19.5 cm C) Orbit of a proton is a straight line and it does not have a radius D) 3.1 cm E) None of the above Motional emfs in the Earth's weak magnetic field are ordinarily very small. Consider a metal rod of 1 m in length moving perpendicular with speed of about 3.0 m/s in Earth magnetic field of strength 5 times 10^-5 T .How large is the induced electrical potential? A) 1500 mu V B) 275 m V C) 150 mu V D) 314 mu V E) None of the above

Explanation / Answer

solution for 7

given charge = 720C

time = 4 seconds

as we all know current = charge/time

= 720/4

= 180A = option A

solution for 8

the reason why metal carrying current is heated up is that when current flows through them battery converts the chemical energy into electric potential energy. this electric potential energy is given to electrons and electrons try to minimize them by converting them into kinetic energy. since the wires have some resistance which resists the motion of electrons, the electron bump into atom on outside of wire and some of kinetic energy is converted to thermal energy.

so the answer is heat is result of electrons having more kinetic energy beacause the potential difference sets them into motion.

option D

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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