You used a function of current and some other constants to find B. B, according

Question

You used a function of current and some other constants to find B. B, according to this function, was constant. Considering the equation e/m = 8B-2 * Vd-2, and considering your data, is B constant for a given current? And how do you know this? Select one:

A. B must be constant for a given current because the equation is made only from constants; B=(4/5)1.5oN*I*r-1

B. B was not constant, even though it said it was, because diameter of beam is getting bigger so B must change since the bigger d numerically makes the ratio V/d2 get smaller.

C. B, according to my data, was not a constant value. My Vd-2 consistently decreased as the diameter increased. e/m can remain constant with a decreasing Vd-2 only if B decreases as well.

D. B must be constant because I want it to be constant since the lab manual told me it was constant.

Explanation / Answer

A) B must be constant for a given current because the equation is made only from constants; B=(4/5)1.5oN*I*r-1

This is because magnetic field depends on current(I) and distance from the current element (r).As the current is constant B must be a constant as all other parameters in the equation are also constant.

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