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3 years ago

What is the direction of magnetic field lines inside any magnet?

Physics

1 answer:

Sati [7]3 years ago

3 0

Answer: Option B.) they travel from south to north

Inside the magnet, the field lines travel from South to North.

Explanation:

A magnet has two poles: North and South. The magnetic field lines originate from North and end at south pole. Maximum field lines are at the poles. Inside the magnet, the field lines travel from South pole to North pole. Overall, the field lines form a loop.

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Sally Sizzle builds a circuit by connecting three resistors in oarallel with a 9v battery. The current in this curvuit is 3.6 am

Sergeeva-Olga [200]

Answer:

The new resistor has resistance of 9Ω.

Explanation:

The effective resistance of three resistance is

$(1). \: \: \frac{1}{R_e} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}$ .

we know the the circuit with 9V battery has current of 3.6A; therefore, $R_e$ must be

$V = IR_e$

$R_e = \dfrac{V}{I} = \dfrac{9V}{3.6A}$

$R_e = 2.5\Omega$ ,

which means

$\frac{1}{2.5\Omega } = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}$

$\boxed{0.4\Omega^{-1} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3} .}$

Now, Sally wants to connect another resistor in parallel so that the current becomes 4.6A. The resistance required for that is

$R_{new} = \dfrac{9V}{4.6A}$

$R_{new} = 1.957 \Omega$ .

which means the 4th resistor $R_4$ must satisfy the equation

$(2), \: \: \frac{1}{1.957\Omega} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}+\frac{1}{R_4} ,$

and since

$\frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3} =0.4\Omega^{-1},$

equation (2) becomes

$\frac{1}{1.957\Omega} =0.4\Omega^{-1}+\frac{1}{R_4} ,$

which we solve for $R_4$ :

$0.511\Omega^{-1} =0.4\Omega^{-1}+\frac{1}{R_4} ,$

$0.111\Omega^{-1} = \dfrac{1}{R_4}$

$\boxed{R_4 = 9\Omega}$

Thus, the resistance of the new resistor is 9 ohms.

3 0

4 years ago

A block of height 120mm is placed on top of another block with a height of 1.50 m. What is the height of the two blocks together

pav-90 [236]

We will first convert all units to meters and then solve the problem.
We are given that:
1000 mm = 1 m
120 mm = ?? meters
using cross multiplication:
120 mm = (120*1) / 1000 = 0.12 m

Now, when the two objects are placed over each other, their total height is the result of summation of both heights, therefore:
total height = 0.12 + 1.5 = 1.62 m

Based on the above calculations, the correct choice is:
b) 1.62 m

6 0

4 years ago

What is a good scientific question on a baloon powered car? (it's for my science fair)

Salsk061 [2.6K]

Answer:

Balloon powered car works on the principle of Newtons III law. Escaping air from the balloon, the car accelerates forward. The reaction is the air behind the car, pushing against it, and with the same force car moves forward is the action.

Some scientific questions are:

1. What is the energy stored in the balloon?

Ans: Potential energy (Potential energy is stored in elastic balloon)

2. Which energy is used in balloon-powered car?

Ans: Kinetic energy. (Whenever the balloon escapes the air, potential energy is converted into Kinetic energy)

3. What is the principle involved in balloon powered car?

Ans: Newtons III law.

6 0

4 years ago

Explain the expression “light travels at a speed”.

Anestetic [448]

Some things travel faster than the speed of light

7 0

3 years ago

How much WATER needed to offset the force of jumping down from 20metre in vacuum environment,to keep me alive.

kenny6666 [7]

Answer:

it's quite difficult

Explanation:

6 0

3 years ago