The value of magnetic flux is 10Wb when magnetic lines of force containing magnetic field strength of 1T passing through unit area of 10m2 then angle between magnetic field and unit area is?

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