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3 years ago

Which of the following statements is true about magnetic fields produced by current-carrying wires?

2 answers:

7 0

The larger the current flowing in a wire, the stronger the magnetic field
is that surrounds the wire.

That's why, if you want to make an electromagnet stronger, one way to
do it is to add another battery. By increasing the voltage, you'll increase
the current flowing in the coils of wire, and the electromagnet will be stronger.

kari74 [83]3 years ago

6 0

Answer:

option (a) and (C)

Explanation:

The magnetic field strength due to a current carrying wire is directly proportional to the amount of current flowing through the conductor and the length of the conductor. By the Biot Savart's law, the amount of magnetic field strength produced due to a small length element is given by

dB = k dl x i / r^2

Where, dl is the small length element, i be the current and r be the distance from the conductor where the magnetic field strength is to be calculated.

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A child goes down a slide, starting from rest. If the length of the slide is 2 m and it takes the child 3 seconds to go down the

Nitella [24]

Answer:

0.44 m/s^2

Explanation:

initial velocity = 0 (since the child starts from rest)

distance covered by the child = 2 m (the length of the slide)

time taken = 3 sec

acceleration of the child = ?

using Newton's equation of motion

s = $ut + \frac{1}{2}at^{2}$

where s is the distance covered by the child

u is the initial velocity

a is the acceleration

t is the time spent

substituting values, we have

2 = 0(3) + $\frac{1}{2}a*3^{2}$

2 = 9a/2

4 = 9a

a = 4/9 = 0.44 m/s^2

5 0

3 years ago

Electrical equipment is required to be adequately protected against short-circuit current conditions per NEC 110.10 and several

Anna11 [10]

ANSWER:

The statment is true.

STEP-BY-STEP EXPLANATION:

Per Osha 1910.303 b (5):

The overcurrent protective devices, the total impedance, the component short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without the occurrence of extensive damage to the electrical components of the circuit. This fault shall be assumed to be either between two or more of the circuit conductors, or between any circuit conductor and the grounding conductor or enclosing metal raceway.

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2 years ago

Potential energy is _____ energy. A. heat B. stored C. released

crimeas [40]

Answer:

Potential energy is stored energy.

3 0

2 years ago

Read 2 more answers

If you throw a ball into the air, Earth exerts a force on the ball. The ball in the air exerts no force on Earth. True or false?

Lina20 [59]

Answer: