The Earth's magnetic field is approximately
Correct answer: B. 50 microtesla
- A. 5 tesla
- B. 50 microtesla
- C. 50 millitesla
- D. zero at the equator
Explanation
At around 50 microtesla the geomagnetic field is weak enough that a compass needle needs to be delicately mounted to respond to it, and strong enough to deflect charged particles from the Sun. The field is horizontal near the magnetic equator and dips steeply near the poles. A laboratory electromagnet is thousands of times stronger.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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