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3 years ago

Which characteristics describe a point charge?

Physics

1 answer:

wolverine [178]3 years ago

6 0

Answer:

Explanation:

becauase i just tooke the test

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A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic fie

Scilla [17]

Answer:

Induced current, I = 0.5 A

Explanation:

It is given that,

number of turns, N = 20

Area of wire, $A=50\ cm^2=0.005\ m^2$

Initial magnetic field, $B_i=2\ T$

Final magnetic field, $B_f=6\ T$

Time taken, t = 2 s

Resistance of the coil, R = 0.4 ohms

We know that due to change in magnetic field and emf will be induced in the coil. Its formula is given by :

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

Where

$\phi=BA$

$\epsilon=\dfrac{-d(NBA)}{dt}$

$\epsilon=NA\dfrac{B_f-B_i}{t}$

$\epsilon=20\times 0.005\times \dfrac{6-2}{2}$

$\epsilon=0.2\ V$

Let I is the induced current in the wire. It can be calculated using Ohm's law as :

$\epsilon=I\times R$

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

$I=\dfrac{0.2}{0.4}$

I = 0.5 A

So, the magnitude of the induced current in the coil is 0.5 A. Hence, this is the required solution.

5 0

3 years ago

The type of tectonic plate boundary that occurs when two plates are colliding into each other is known as a

ruslelena [56]

The answer is convergent boundary

6 0

3 years ago

Read 2 more answers

What mass of ice (in g) can be melted if 27.2 kJ of thermal energy are added at the freezing point? Use molar mass = 18.02 g/mol

san4es73 [151]

Answer : The mass of ice melted can be, 3.98 grams.

Explanation :

First we have to calculate the moles of ice.

$Q=\frac{\Delta H}{n}$

where,

Q = energy absorbed = 27.2 kJ

$\Delta H$ = enthalpy of fusion of ice = 6.01 kJ/mol

n = moles = ?

Now put all the given values in the above expression, we get:

$27.2kJ=\frac{6.01kJ/mol}{n}$

$n=0.221mol$

Now we have to calculate the mass of ice.

$\text{Mass of ice}=\text{Moles of ice}\times \text{Molar mass of ice}$

Molar mass of ice = 18.02 g/mol

$\text{Mass of ice}=0.221mol\times 18.02g/mol=3.98g$

Thus, the mass of ice melted can be, 3.98 grams.

3 0

4 years ago

What two units of air pressure are commonly used in weather reports?

konstantin123 [22]

The two units are Inches of Mercury and Millibars

7 0

3 years ago

PLEASE HELP ME I AM STUCK, FRUSTRATED, AND DONT EVEN KNOW HOW TO START THIS PROBLEM AHHSRFHRERHYT

Naily [24]

It takes the car 14 seconds to stop

Explanation:

A car is traveling at a constant velocity of 19 m/s when the driver puts

on the brakes to accelerate it at -1.4 m/s² until stopped

1. The initial velocity is 19 m/s

2. The acceleration is -1.4 m/s²

3. The final velocity is zero

We need to find how long it takes the car to stop

We can find the time by using the rule

→ v = u + a t

where v is the final velocity, u is the initial velocity, a is the

acceleration and t is the time

→ v = 0 m/s , u = 19 m/s , a = -1.4 m/s²

Substitute these values in the rule

→ 0 = 19 + (-1.4) t

→ 0 = 19 - 1.4 t

Add 1.4 t to both sides

→ 1.4 t = 19

Divide both sides by 1.4

→ t = 13.57 ≅ 14 seconds

It takes the car 14 seconds to stop

Learn more:

You can learn more about velocity in brainly.com/question/10772739

#LearnwithBrainly

4 0

3 years ago