Physics, 22.10.2020 17:01 tyrareed702

A beam of protons is directed in a straight line along the positive zz ‑direction through a region of space in which there are crossed electric and magnetic fields. If the electric field magnitude is E=450E=450 V/m in the negative yy ‑direction and the protons move at a constant speed of v=7.9×105v=7.9×105 m/s, what must the direction and magnitude of the magnetic field be in order for the beam of protons to continue undeflected along its straight-line trajectory? Select the direction of the magnetic field BB .

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Answer from: quincyjosiah07

The magnitude is $B = \frac{450}{7.9* 10^5}$

The direction is the positive x axis

Explanation:

From the question we are told that

The electric field is E = 450 V/m in the negative y ‑direction

The speed of the proton is $v= 7.9* 10^5\ m/s$ in the positive z direction

Generally the overall force acting on the proton is mathematical represented as

$F_E = q(\vec E + \vec v * \vec B)$

Now for the beam of protons to continue un-deflected along its straight-line trajectory then F_E =0

$0 = q( E (-y) + v(z) * \vec B)$

=> $E\^y = v \^ z * \vec B$

Generally from unit vector cross product vector multiplication

$\^ z \ * \ \^ x = \^ y$

So the direction of B (magnetic field must be in the positive x -axis )

$E\^y = v \^ z * B\^ x$

=> $E\^y = vB ( \^ z * \^ x)$

=> $E\^y = vB ( \^y)$

=> E = vB

=> $B = \frac{450}{7.9* 10^5}$

=> $B = 0.0005696 \ T$

Answer from: Quest

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

Use the table above to find the yearly premiums in each of the following cases. emily ruth webster i

Answer from: Quest

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol

b. a hockey puck sliding across the ice

c. a compressed spring

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice is the correct option.

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