Convert 200erg into joules.

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

C. the electric current passes from the slip rings, through the brushes, and to the collection device.

The answer would be d. hope this : ))