Question

Four charges +q, +q, -qand -q are placed respectively at the four corners A, B, C and D of a
square of side a. Calculate the force on a charge Q placed at the centre of the square.

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

A Hall effect flow probe is placed on an artery, applying a 0.100-T magnetic field across it, in a setup similar to that in Figure 3. What is the Hall emf, given the vessel’s inside diameter is 4.00 mm and the average blood velocity is 20.0 cm/s?

Strategy

Because B, v, and l are mutually perpendicular, the equation ε = Blv can be used to find ε.

Solution

Entering the given values for B, v, and l gives

ϵ

=

B

l

v

=

(

0.100

T

)

(

4.00

×

10

−

3

m

)

(

0.200

m/s

)

=

80.0

μ

V

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