An alpha particle $($a He nucleus, containing two protons and two neutrons and having a mass of $6\mathrm{.}641027$kg$)$ traveling horizontally at $35\mathrm{.}6$ km$/$s enters a uniform, vertical, $1\mathrm{.}80$ T

magnetic field.

Part A

What is the diameter of the path followed by this alpha particle?

Express your answer with the appropriate units.

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Activate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

d

$=$

nothing

nothing

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Part B

What effect does the magnetic field have on the speed of the particle?

The speed remains constant.The speed increases with time.The speed decreases with time.

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Part C

What is the magnitude of the acceleration of the alpha particle while it is in the magnetic field?

Express your answer with the appropriate units.

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a

$=$

nothing

nothing

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Part D

What is the direction of this acceleration?

The acceleration is perpendicular to v$$

and parallel to B$$

and so is horizontal, along the particle$$s path.The acceleration is perpendicular to v$$

and B$$

and so is horizontal, toward the center of curvature of the particle$$s path.The acceleration is perpendicular to v$$

and B$$

and so is horizontal, out of the center of curvature of the particle$$s path.The acceleration is parallel to v$$

and perpendicular to B$$

and so is vertical, along the particle$$s path.

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