A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C. Determine the charges on surfaces a, b, and c respectively. Express the answer in coulombs.

Explanation:

At the center of the conductor  lies the sphere of radius r which contains charge 1C . The sphere is a conductor so all its charge will lie on its surface . Hence on surface c charge lying = 1 C .

Charge on surface c will induce a charge - 1C on inner surface of hollow outer conductor so charge on inner surface b of the hollow conductor will b - 1 C .

Here it is to be noted that the charge carried by hollow conductor will lie on its surface . so on surface a of hollow conductor , its charge 2C will lie . Apart from it a charge + 1 C will also be induced on it due to charge on the inner sphere . Hence total charge on surface a will be 2C +1C = +3C .

with 5 seconds, no, but over time if the police car stays at 65m/s ad the speeding car stays at 60, then obviously yes, but the answer to your question would be, no.

hope this : )

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles