The direction of the electric field is always directed in
the direction that a positive test charge would be pushed or pulled if placed in the space surrounding the source charge
. Since electric field is a vector quantity, it can be represented by a vector arrow.
What is the direction of the electric field within the rod?
The conducting rod is moving in a
plane perpendicular to
B. A motional emf is produced. The right-hand rule tells us that the magnetic force on positive charges will point in the direction away from the origin, the magnetic force on negative charges will point towards from the origin.
What is the direction of electric field?
Electric field is defined as electric force per unit charge. … The direction of electric field produced by positive charges is
radially outward from the charge
, i.e. away from the point charge. The direction of electric field produced by negative charges is radially toward the charge, i.e. towards the point charge.
What is the potential difference across the rod?
This means that when we write the equation for the EMF, or potential difference, established across one-half of our rod, we can use this simplified form, where that potential
difference equals the length of the half of the rod multiplied by its speed or the magnitude of the velocity times the strength of the magnetic
…
In nature, emf is
generated when magnetic field fluctuations occur through a surface
. … In an electrical generator, a time-varying magnetic field inside the generator creates an electric field via electromagnetic induction, which creates a voltage difference between the generator terminals.
In which case is electric field present?
Electrostatic fields
Such fields are present when
systems of charged matter are stationary
, or when electric currents are unchanging. In that case, Coulomb’s law fully describes the field.
Can an electric field be zero?
There is no zero-field point
for a pair of equal-magnitude-but-opposite-sign charges. Electric field is zero in that point because the sum of electric field vectors have same intensity and direction, but are opposite. That point is halfway between two like charges.
Can electric field be negative?
Electric field is not negative
. It is a vector and thus has negative and positive directions. An electron being negatively charged experiences a force against the direction of the field. For a positive charge, the force is along the field.
Which point A or B has a higher potential?
The word “potential” means simply V, so
point B is at a higher potential than point A
. Once you know that, you can go and remind yourself of the relationship between electric field and potential (no doubt it’s in your textbook).
What is the magnitude of the force required to keep the rod moving at a constant speed?
The magnitude of the force required to keep the rod moving at a constant speed is
0.37 N
.
When the charges in the rod are in equilibrium?
Express your answer in volts per meter to at least three significant digits. If the charge on the rod is in equilibrium, then
the electric force and the magnetic force acting on the charge on the rod are equal and opposite in direction
.
Is there an electric field inside a solenoid?
With Gauss’s law, this becomes in integral form . The current carrying solenoid has radial symmetry and the enclosed is zero. This equation tells us
there will be no radial electric field inside a solenoid
, even for a time-varying current.
What induces an electric field?
A changing magnetic flux
induces an electric field. Both the changing magnetic flux and the induced electric field are related to the induced emf from Faraday’s law.
What is SI unit of emf?
Electromotive force or e.m.f is defined as the battery’s energy per Coulomb of charge passing through it. like other measures of energy per charge emf has SI unit of
volts
, equivalent to joules per coulomb.
Where is electric field strongest?
The relative magnitude of the electric field is proportional to the density of the field lines.
Where the field lines are close together the field is strongest
; where the field lines are far apart the field is weakest.
What is called electric field?
electric field,
an electric property associated with each point in space when charge is present in any form
. The magnitude and direction of the electric field are expressed by the value of E, called electric field strength or electric field intensity or simply the electric field.
