Nerical Problems 8m
680 N
A load of 680 N is lifted from A to C by 500 N force
on an inclined plane as shown in the diagram.
500N
Study the diagram and calculate:
12 m
i.
Output work
ii. Input work
iii. Mechanical advantage
iv. Velocity ratio V. Efficiency
(Ans: i. 5.44x109), ii. 6x109 J, iii. 1.36, iv.1.5, v. 90.6%)
A
B.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.