When the piece of metal blundered into the air-core coil, it changed the inductance of the coil.
The most common difference between the two is that while conductors allow free flow of electrons from one atom to another, insulators restrict free flow of electrons. Conductors allow electrical energy to pass through them, whereas insulators do not allow electrical energy to pass through them.
D because u r using your energy to do all the things
If you are not advised to evacuate or are unable to do so safely, stay indoors, away from windows, skylights and doors. Continue to monitor weather reports and do not go outside until the storm has passed. And, to protect your children from seeing too many sights and images of the hurricane, limit media exposure.
Answer:
Option b
Explanation:
The formula of momentum is 
where p is the momentum , m is the mass in kg and v is the velocity in m/s, so
a) momentum is

b) momentum is

c) momentum is
here since the rock is sitting on top of a hill which means the object is stationary or in other words the object is at rest, which means if an object is at rest the velocity is 0m/s so momentum is zero of a stationary object because

d) momentum is

so the highest momentum is in part b which is 12 so option b is our answer.