The current is zero in a conductor when no potential difference is applied because: otherwise Ohm's law would not be valid. the electrons are not moving. the electrons are not moving fast enough. for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction. equal numbers of electrons and protons are moving together.

Q: In the Bohr model of the hydrogen atom, an electron in the 1st excited state moves at a speed of…

A: we know that Time taken to orbit = Distance/Velocity also Current = Q/T

Q: A spool of aluminum wire 200 m long and with a diameter of 0.360 mm is at 20.0°C. For aluminum, the…

A:

Q: L A 230-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,070…

A:

Q: 13.A copper wire and an iron wire with the same length and diameter carry the same current!. (a)…

A:

Q: 7x1020 electrons are flowing past any point in wire per minute (electron charge = .6×10-¹9 C). O How…

A:

Q: Question 10 When there is a difference in Electric Potential (voltage) in a closed circuit, current…

A: 10 . When there is a difference in Electric Potential (voltage) in a closed circuit, current flows…

Q: A potential difference of 1.5 V is applied across a tungsten wire of length 2.4 m and cross-…

A: According to company policy, only first question will be answered here. Please post the rest…

Q: A conductor of gold with length L=10cm , and radius r=1 cm , carrying a current I = 2A , and the…

A: Given,  length L=10cm radius r=1 cm current I = 2A number of free electrons n=5*1028 elec/m3 .  ΔV =…

Q: How many electrons pass a position in a circuit every second if the current in this circuit is 15 A…

A:

Q: 6) A hollow соррес wire with an inner diameter of 0.70mm and an outer diameter of 2.2mm carries a…

A: Given data:  A hollow copper wire Inner diameter (di) = 0.70 mm Outer diameter (do) = 2.2 mm Current…

Q: What is true about the charged particles moving through an electric circuit? O They can move through…

A:

Q: A battery-operated car utilizes a 12.0 V system. Find the charge the batteries must be able to move,…

A: The kinetic energy (KE) needed to accelerate the car from rest to 55 m/s can be calculated using the…

Q: Good conductors of electricity are often good conductors of heat. Why might this be?   We are…

A:

Q: 2) Two particles both have a positive charge of 3 coulombs each and present an electrostatic force…

A: Given, q1=q2=+3 C Force, F=100x109 N

Q: When a 12.0 V car battery runs a single 30.0 W headlight, how many electrons pass through it each…

A: Given data:  Voltage (V) = 12.0 V Power (P) = 30.0 W Time (t) = 1 s Required: The number of…

Q: a potential difference is applied across a conducting wire. The electrons in the wire will move with…

A: When we apply potential difference across a conductor electrons starts moving from lower potential…

Q: A student left his V = 9.0 V, P = 7.0 W radio turned on at full volume from 9:00 PM to 2:00 AM.  How…

A: Solution:   Given Values,   Power(P)=7.0 W Voltage(V)=9.0 V   It is given that, Full volume from…

Q: An aluminum wire (p = 2.82x108 Qm at 20 °C and a = 3.9x10³ °C') with a diameter of 0.085 mm has a…

A:

Q: A cathode ray tube (CRT) is a device that produces a focused beam of electrons in a vacuum. The…

A: Average current , I =31.00

Q: In the Bohr model of the hydrogen atom, an electron in the lowest energy state moves at a speed of…

A: The time is,

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.