Because it is too hard to find a specimen on high power. Easier to find them and focus them on low power and then increase the magnification and fine-tune the focus to get a better, closer look.
That's probably going to depend on where the charge is, or, for that matter, the nature of the origin of the field. There is much here that you have not told us.
The earth's magnetic field is caused by the circulating magma of the outer core going around the solid iron inner core.
There is no reason to believe that the Earth's magnetic field will change any time soon... or, for that matter, that anything extraordinary is going to happen in 2012.
Using a compass is the easiest way. The needle is going to point to the Magnetic North Pole. That means that the compass needle is ALIGNED with the Magnetic Field Lines of the Earth's magnetic field at your current position.
If you rinse your hair with cold water before getting out of the shower/bath it will stop it from going static when you try to style or brush it, this works for me! (:
Because when looking at it from far, then you can see more of the specimen, However, when you're looking at it closer up in a high power mode, then you will see less of the object, but much closer.
Because it is too hard to find a specimen on high power. Easier to find them and focus them on low power and then increase the magnification and fine-tune the focus to get a better, closer look.
It helps to get prepared and energize the players before going into the field of play
ceiling voltage is the maximum field voltage that the exciter can withstand before going into unstability
Up is are far as you can go before leaving one gravity field and entering another. Once you enter a new gravitational field, you are no longer going up.
Going to high power on a microscope decreases the area of the field of view. The field of view is inversely proportional to the magnification of the objective lens. ... The specimen appears larger with a higher magnification because a smaller area of the object is spread out to cover the field of view of your eye
Economics
That, or the gauge is going. Or a loose wiring connection. I'd bet on the last.
The field was gone to
field going throught the field
The Stevens model 1915 favorite is going for between 125.00 dollars with a specimen in 60% original finish remaining to as high as 300.00 dollars for a specimen that retain,s 90% of its original finish.
The Stevens model 240 over under shotgun is going for between 155 dollars for a specimen in 60% original finish to 275 dollars for a specimen in 95% original condition.