Anvarious other smaller sized unit, referred to as the gauss (G), wright here 1 G=10−4T1 G=10−4T size 121`G=”10″ rSup size 8 – 4 `T , is occasionally provided. The strongest long-term magnets have actually areas close to 2 T; superconducting electromagnets may acquire 10 T or more. The Earth’s magnetic field on its surchallenge is only around 5×10−5T5×10−5T dimension 125 times “10” rSup dimension 8 – 5 `T , or 0.5 G.

You are watching: What is the direction of the magnetic field that produces the magnetic force on a positive charge

The direction of the magnetic force FF dimension 12F is perpendicular to the airplane developed by vv dimension 12v and BB, as figured out by the best hand preeminence 1 (or RHR-1), which is portrayed in . RHR-1 states that, to recognize the direction of the magnetic pressure on a positive relocating charge, you point the thumb of the right hand also in the direction of vv, the fingers in the direction of BB, and a perpendicular to the palm points in the direction of FF. One way to remember this is that tbelow is one velocity, and so the thumb represents it. Tbelow are many type of field lines, and so the fingers represent them. The force is in the direction you would certainly push with your palm. The force on an adverse charge is in precisely the opposite direction to that on a positive charge.

Magnetic areas exert forces on moving charges. This pressure is just one of the the majority of basic recognized. The direction of the magnetic force on a moving charge is perpendicular to the aircraft created by vv and BB dimension 12B and complies with best hand also rule–1 (RHR-1) as shown. The magnitude of the pressure is proportional to qq size 12q , vv dimension 12v , BB dimension 12B , and the sine of the angle between vv size 12v and BB size 12B .
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With the exemption of compasses, you rarely watch or personally suffer pressures because of the Earth’s little magnetic field. To highlight this, suppose that in a physics lab you rub a glass rod through silk, placing a 20-nC positive charge on it. Calculate the pressure on the rod as a result of the Earth’s magnetic area, if you throw it with a horizontal velocity of 10 m/s due west in a location wbelow the Earth’s area is due north parallel to the ground. (The direction of the force is figured out with appropriate hand dominance 1 as shown in .)

A positively charged object moving due west in a region wright here the Earth’s magnetic field is due north experiences a pressure that is right down as shown. A negative charge moving in the same direction would feel a pressure straight up.

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Strategy

We are given the charge, its velocity, and also the magnetic field strength and also direction. We can hence usage the equation F=qvBsinθF=qvBsinθ dimension 12F= ital “qvB””sin”θ to uncover the pressure.

Solution

The magnetic pressure is


What is the direction of the magnetic pressure on a positive charge that moves as presented in each of the 6 situations shown in ?

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What is the direction of the velocity of an adverse charge that experiences the magnetic force displayed in each of the three cases in , assuming it moves perpendicular to B?B? size 12B?

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What is the direction of the magnetic area that produces the magnetic pressure on a positive charge as displayed in each of the 3 situations in the number listed below, assuming BB dimension 12B is perpendicular to vv dimension 12v ?