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3 years ago

If the vector below is multiplied by 2, what will be its end point?

Physics

2 answers:

Dvinal [7]3 years ago

8 0

B. (4, -2) duble each component

nadya68 [22]3 years ago

6 0

Answer: B. (4, -2)

Explanation:

The vector shown in the image is (2, -1)

Now, the scalar multiplication for vectors works in the next way:

for a scalar c and a vector (x,y)

c*(x,y) = (c*x, c*y)

In our case, the scalar is 2, and the vector is (2, -1)

2*(2, - 1) = (2*2, -1*2) = (4, -2)

Then the correct option is the option B.

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Time = 0.53 sec

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Using formula of emf

$\epsilon=-N(\dfrac{\Delta \phi}{\Delta t})$

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(C). If the coil resistance is 2.5 Ω.

We need to calculate the induced current

Using formula of current

$I=\dfrac{\epsilon}{R}$

Put the value into the formula

$I=\dfrac{0.016867}{2.5}$

$I=0.00675\ A$

$I=6.75\ mA$

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