A uniform meter bar is supported at 30cm mark and block of 8N is placed at nearer end so that system remain in equilibrium. What will be weight of meter bar? a) 15N b) 12N c) 18N

electromagnetic waves travel through space with vacuums. give me brainliest if right.

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.