Table of Contents

- 1 How do you find the current in a magnetic field?
- 2 What is the field created current?
- 3 What is the formula of per magnet?
- 4 What is the difference between electric field and current?
- 5 What is the relationship between force and current?
- 6 When does a change in the number of field lines cause a current?
- 7 How are the magnetic field lines of a current loop?

## How do you find the current in a magnetic field?

The Biot-Savart Law can be used to determine the magnetic field strength from a current segment. For the simple case of an infinite straight current-carrying wire it is reduced to the form B=μ0I2πr B = μ 0 I 2 π r .

**What is a current field?**

: the current supplied to the field windings of a generator or motor to establish the magnetic field for its operation.

### What is the field created current?

magnetic field

The magnetic field created by current following any path is the sum (or integral) of the fields due to segments along the path (magnitude and direction as for a straight wire), resulting in a general relationship between current and field known as Ampere’s law.

**What is the force of current?**

We can derive an expression for the magnetic force on a current by taking a sum of the magnetic forces on individual charges. (The forces add because they are in the same direction.) The force on an individual charge moving at the drift velocity vd is given by F = qvdB sin θ.

## What is the formula of per magnet?

In CGS, it is written as B = H + 4πM. (The pole approach gives μ0H in SI units. A μ0M term in SI must then supplement this μ0H to give the correct field within B, the magnet. It will agree with the field B calculated using Ampèrian currents).

**Where is the magnetic field due to a straight current wire weaker?**

In general, the magnetic field is strongest close to the wire and weaker farther away. In fact, the magnetic field weakens as where is the distance from the wire.

### What is the difference between electric field and current?

Answers and Replies Electric current is equal to one direction moving electrons in closed circular loop. We visualize the electric force (the “negative” force of the electrons) with the electric field. Also the protons have electric force. An electric field is the space around charged particle which it effects.

**Is current an electric field?**

Since the electric force depends on the value of the charge (Q) (and not the mass), the electric field is the force per unit charge—or Newtons per Coulomb (N/C). There is an electric current in a wire because there is an electric field inside the wire.

## What is the relationship between force and current?

What is the relationship between force and current? Force is directly proportional to current; as the current that passes through the wire increases, so does the magnetic force.

**What does F BIL stand for?**

F = BIL (f=force, b=magnetic field, i=current, l=length of conductor)

### When does a change in the number of field lines cause a current?

Change in the number of field lines through a coil gives a current. Number of field lines through a coil is called magnetic flux When a loop is moved parallel to a uniform magnetic field, there is no change in the number of field lines passing through the loop and no induced current.

**How big is the magnetic field produced by a current?**

So a moderately large current produces a significant magnetic field at a distance of 5.0 cm from a long straight wire. Note that the answer is stated to only two digits, since the Earth’s field is specified to only two digits in this example. The magnetic field of a long straight wire has more implications than you might at first suspect.

## How are the magnetic field lines of a current loop?

Notice that one field line follows the axis of the loop. This is the field line we just found. Also, very close to the wire, the field lines are almost circular, like the lines of a long straight wire. Figure 12.12 Sketch of the magnetic field lines of a circular current loop.

**How do I change the size of a field?**

In the table design grid, select the field for which you want to change the field size. In the Field Properties pane, on the General tab, enter the new field size in the Field Size property. You can enter a value from 1 to 255. This number specifies the maximum number of characters that each value can have.