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3 years ago

8

A student wants you to demonstrate that an electric current will produce a magnetic field.

2 answers:

ElenaW [278]3 years ago

8 0

to demonstrate magnetic field will be produced around electric current, simply set a simple electric circuit through batteries, complete the circuit and bring a magnetic compass near the wire carrying electric current, there will be deflection in the compass, that shows, magnetic field is produced through electric current.

spin [16.1K]3 years ago

8 0

answer: a) a battery, a coil of wire and a compass.

i did the usatestprep.

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Answer:

Radius, r = 2.88 meters.

Explanation:

It is given that,

A hydrogen-filled balloon is used to lift a 120-kg stone off the ground, m₁ = 120 kg

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Mass density of air, $d=1.29\ kg/m^3$

We know that buoyant force is equal to the weight of liquid displaced i.e.

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$r^3=\dfrac{3B}{4\pi dg}$

$r^3=\dfrac{3\times 1274}{4\pi \times 1.29\times 9.8}$

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So, the minimum radius R of the balloon be in order to lift the stone off the ground is 2.88 meters. Hence, this is the required solution.

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