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3 years ago

Which statement is the correct representation of these electric field lines?

Physics

2 answers:

enyata [817]3 years ago

7 0

Answer:

C. Source A is negatively charged and source B is positively charged.

Explanation:

As per the properties of electric field lines we know that electric field lines originated out from the positive charge and then terminated back into the negative charge.

As per the given presentation of field lines we can see that field originated out from charge placed at B and these field lines again terminated into the charge placed at A.

So here the charge must be positive at position of B and it is negative at position of A.

so correct answer will be

C. Source A is negatively charged and source B is positively charged.

Kipish [7]3 years ago

5 0

Note that the electric field lines begin from the higher voltage to the lower

Because the negative pole is lower voltage than the positive pole

The lines go out the positive charges and go in the negative charges

Then, the correct statement is:

C. Source A is negatively charged and source B is positively charged.

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a current of 5 ampere is passed for 2 hours in an electric iron having a resistance of 100 ohms calculate the heat produced

Alina [70]

Answer:

$\boxed{\sf Heat \ produced \ (H) = 5 \ kWh}$

Given:

Resistance (R) = 100 Ω

Current (I) = 5 A

Time (t) = 2 hours

To Find:

Heat developed (H) in the electric iron

Explanation:

Formula:

$\boxed{ \bold{ \sf H = I^2Rt}}$

Substituting values of I, R & t in the equation:

$\sf \implies H = {5}^{2} \times 100 \times 2 \\ \\ \sf \implies H = 25 \times 100 \times 2 \\ \\ \sf \implies H = 5000 \\ \\ \sf \implies H = 5 \: kWh$

$\therefore$

Heat developed (H) in the electric iron = 15 kWh

3 0

4 years ago

If the current through a resistor is 12 A and the voltage drop is 12 V, what is the power absorbed by the resistor? Answer to th

klasskru [66]

Answer:

144 W

Explanation:

The power absorbed by a resistor is the product of the current passing through it and the voltage drop across it. Hence

$P=IV$

$P=12\text{ A}\times12\text{ V}=144 \text{ W}$

Other variations of this formula are derived using Ohm's law, $V=IR$

$P=I^2R=\dfrac{V^2}{R}$

$R$ is the resistance of the resistor. It is what causes the voltage drop.

7 0

4 years ago

Relate the output of energy from a heat engine to the energy put into the heat engine considering the second law of thermodynami

Vinil7 [7]

Answer:

Considering the II law of thermodynamics

From the figure

Out put of energy:

Heat supplied from the source/ reservoir (Q₁) - Heat rejected to the surroundings from the system (Q) = Q₁ - Q₂. Also known as Net work done on the system.

Input of energy:

Amount of heat energy supplied to the system from the source (Q₁ ).

Efficiency (H.E) = η = Output÷ Input

η = (Q₁ - Q₂) ÷ Q₁

OR η = Wnet ÷ Q₁ ; since Wnet = (Q₁ - Q₂)

3 0

3 years ago

A cyclotron is designed to accelerate protons (mass 1.67 x 10^-27 kg) up to a kinetic energy of 2.5 x 10^-13 J. If the magnetic

Dafna11 [192]

Answer:

24 cm

Explanation:

Given:

Mass of proton = 1.67 × 10⁻²⁷ Kg

kinetic energy = 2.5 × 10⁻¹³ J

magnetic field in the cyclotron, B = 0.75 T

Now,

Kinetic energy = $\frac{1}{2}mv^2$ = 2.5 × 10⁻¹³ J

where, v is the velocity of the electron

$\frac{1}{2}\times1.67\times10^{-27}\times v^2$ = 2.5 × 10⁻¹³ J

v² = 2.99 × 10¹⁴

v = 1.73 × 10⁷ m/s

also,

centripetal force = magnetic force

$\frac{mv^2}{r}$ = qvB

q is the charge of the electron

r is the radius of the dipole magnets

on substituting the respective values, we get

$\frac{1.67\times10^{-27}\times1.73\times10^7}{r}$ = 1.6 × 10⁻¹⁹ × 0.75

r = 0.2408 m ≈ 24 cm

Hence, the correct answer is 24 cm

6 0

3 years ago

What is polarization. How can we remove it?

weqwewe [10]

Polarization is the action of restricting the vibrations of a transverse wave, especially light, wholly or partially to one direction .

7 0

4 years ago