Which changes will cause an increase in the magnetic field of a solenoid? check all letters that apply. a) using more wire loops b) using fewer wire loops c) using a larger current d) using a smaller current e) increasing the spacing between loops f) decreasing the spacing between loops

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by