Which two actions would weaken an electromagnet? O A. Increasing the number of wraps of wire
B. Replacing a 6 V battery with a 9 V battery
O C. Replacing the hollow core of the magnet with a steel core
O D. Replacing the steel core of the magnet with a plastic core
O E. Decreasing the number of wraps of wire
Please help

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Asimply means that over time there was some sort of change.

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.