Which do we do to find the equivalent of resistors in parallel?

a. We sum the inverse of each resistance and then invert the sum

b. We sum the resistances and then invert the sum

c. We sum the inverse of each resistance.

d. We sum the resistances.

We sum the inverse of each resistance and then invert the sum.

Explanation:

The equivalent resistance in case of parallel combination of resistors is given by the formula as :

Here,

R is the equivalent resistance

are individual resistors that are connected in parallel

We can find the value of R as :

So, the correct option is (a) "We sum the inverse of each resistance and then invert the sum".

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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