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drek231 [11]
3 years ago
13

A wire of resistance 7 ohms and length 2.8 m is bent into a circle and is concentric with a solenoid in which the magnetic flux

changes from 6 T·m2 to 4 T·m2 in 0.2 seconds. What is the emf in the wire? V What is the non-Coulomb electric field in the wire? V/m What is the current in the wire?
Physics
1 answer:
Serggg [28]3 years ago
7 0

Answer:

The emf, electric field and the current in the wire are 10 V, 3.57 V/m and 1.43 A.

Explanation:

Given that,

Resistance = 7 ohms

Length = 2.8 m

Time t =0.2

We need to calculate the change in magnetic flux

Using formula of induced emf

\epsilon=\dfrac{d\phi}{dt}

Put the value into the formula

\epsilon=\dfrac{6-4}{0.2}

\epsilon=10\ V

We need to calculate the electric field in the wire

Using formula of electric field

E=\dfrac{V}{l}

E=\dfrac{10}{2.8}

E=3.57\ V/m

We need to calculate the current in the wire,

Using formula of ohm's law

V=IR

I=\dfrac{V}{R}

Put the value into the formula

I=\dfrac{10}{7}

I=1.43\ A

Hence, The emf, electric field and the current in the wire are 10 V, 3.57 V/m and 1.43 A.

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6 0
2 years ago
At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l
Ksju [112]

Answer:

By convention a negative torque leads to clockwise rotation and a positive torque leads to counterclockwise rotation.

here weight of the child =21kgx9.8m/s2 = 205.8N

the torque exerted by the child Tc = - (1.8)(205.8) = -370.44N-m ,negative sign is inserted because this torque is clockwise and is therefore negative by convention.

torque exerted by adult Ta = 3(151) = 453N , counterclockwise torque.

net torque Tnet = -370.44+453 =82.56N , which is positive means counterclockwise rotation.

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5 0
3 years ago
The maximum speed limit on interstate 10 is 75 miles per hour. how many meters per second is this
Dvinal [7]

Answer:

<h2>33.53m/s</h2>

Explanation:

Given the maximum speed limit on interstate 10 as 75 miles per hour, to get the speed in meter per seconds, we need to convert the given speed to meter per seconds.

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75 miles perhour = 75miles/1 hour

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