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Related Concept Videos

Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Related Experiment Video

Updated: Jul 24, 2026

Effects of Transcranial Alternating Current Stimulation on the Primary Motor Cortex by Online Combined Approach with Transcranial Magnetic Stimulation
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Gamma transcranial alternating current stimulation increases segregation in the sensorimotor network.

Antonio Cataneo1, Marco Marino1,2, Nicoletta Manzo3,4

  • 1Department of General Psychology, University of Padova, Padova, Italy.

Frontiers in Psychology
|February 26, 2026
PubMed
Summary

Gamma transcranial alternating current stimulation (tACS) may enhance sensorimotor network segregation in alpha and beta bands. This suggests tACS could improve neural communication and aid motor recovery in clinical populations.

Keywords:
EEGbrain oscillationsgamma oscillationsnetwork connectivitysensorimotor networktACS

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Area of Science:

  • Neuroscience
  • Brain Stimulation
  • Functional Connectivity

Background:

  • Transcranial alternating current stimulation (tACS) is a promising tool for modulating brain dynamics, particularly for motor recovery.
  • Its effects on the sensorimotor (SM) network's functional organization are not fully understood.
  • Investigating gamma-frequency tACS effects on SM network segregation is crucial for understanding its therapeutic potential.

Purpose of the Study:

  • To investigate if gamma-frequency tACS modulates functional connectivity and enhances segregation within the sensorimotor network.
  • To determine the frequency-specific effects of tACS on SM network organization.
  • To assess the potential of tACS for improving motor performance by targeting network interactions.

Main Methods:

  • A within-subject, sham-controlled design using EEG in 34 healthy subjects.
  • Quantification of functional connectivity (IntraNC and InterNC) across SM sub-networks in five frequency bands (delta, theta, alpha, beta, gamma).
  • ANCOVA tests comparing sham and real tACS conditions, using pre-stimulation connectivity as a covariate.

Main Results:

  • No significant interaction between time and stimulation condition was found.
  • Post-hoc analyses revealed significant interactions for IntraNC following real tACS (p=0.029, FDR-corrected).
  • Increased segregation was observed post-tACS in specific SM sub-networks for alpha and beta bands, driven by enhanced IntraNC. No effects were seen in delta or theta bands.

Conclusions:

  • Gamma tACS may selectively modulate oscillatory dynamics within SM sub-networks, enhancing functional segregation in a frequency-specific manner.
  • Observed effects in alpha/beta bands suggest more efficient neural communication, potentially beneficial for motor integration.
  • Results support tACS as a neuromodulatory intervention for targeting dysfunctional network interactions in clinical populations.