How are electromagnets temporary?
A.) They are only magnetic when an electric current runs through them.
B.) They are only magnetic when a gravitational wave runs through them.
C.) They are only magnetic when near a lodestone.
D.) They are only magnetic for two weeks.
Such magnets are called temporary magnets. An electromagnet is a temporary magnet. It is made by winding a coil of insulated wire round a soft iron core. When a current is passed through the coil, the magnetic field produced by the current magnetises the soft iron core. The soft iron core loses all the magnetism when the current is switched off.
So A
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Which air mass brings high temperatures and precipitation to Gwinnett County in late spring?
Answer:
Climate of Georgia. Maritime tropical air masses dominate the climate in summer, but in other seasons continental polar air masses are not uncommon.
Explanation:
How many atoms of Br are there?How many atoms of Br are there?
Answer:
8
Explanation:
There are 8 atoms of Br because there are two molecules of 4 atoms of Br. 4 x 2 = 8.
Answer: 1 mol Br contains 6.022×1023Br atoms;its mass is 79.90 g.
Explanation:
: I mole or bromine refers to 6×10^23 molecules of bromine. But 1 molecule of bromine has 2 atoms. Hence the atom count will be exactly twice.
Please help me with this science question
Answer:
TRUE
Explanation:
The youngest rocks on the ocean floor are located at the oceanic ridge, an underwater mountain range formed from the spreading of tectonic plates
Giving brainliest 4 best answer :> ~~
Answer:
there are blanks in the picture. what kind of winds are being asked about?
How do air masses flow?
from regions of low pressure to high pressure
it depends on the time of the day
from regions of high pressure to low pressure
whichever way the wind blows
How do air masses flow?
from regions of high pressure to low pressure
.
In general, cold air masses tend to flow toward the equator and warm air masses tend to flow toward the poles.
PLZ ANSWER FOR BRAINLIEST
Answer:
C
Explanation:
The ozone layer absorbs ultraviolet rays from the sun.