One day little taehyung found a block of iron, he found out that it's density is 7.8g/cm^3 ,he goes running to RM and Jin and asks what is the mass of 5cm^3 of it is. but RM lost his son koya so he didn't have time to answer, and Jin was eating,
Can you help little taehyung ?
Pleaasse??

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.