NEET > Physics Class 12 > Electric Charges & Fields in One Shot (NCERT)
Electric Charges & Fields in One Shot (NCERT) Video Lecture - Physics Class 12 - NEET
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FAQs on Electric Charges & Fields in One Shot (NCERT) Video Lecture - Physics Class 12 - NEET
| 1. What are electric charges and how do they affect fields? |  |
Ans. Electric charges are fundamental properties of matter that can be positive or negative. When charges are in motion, they create electric fields, which are regions of influence that can affect other charges within their vicinity. The electric fields exert forces on these charges and can cause them to move or interact with other charged particles.
| 2. What is the difference between electric charges and electric fields? | |
Ans. Electric charges refer to the fundamental properties of matter that can be positive or negative, whereas electric fields are the regions of influence created by these charges. Charges have a magnitude and sign, while electric fields have strength and direction. Charges interact with each other through the electric fields they create.
| 3. How are electric fields calculated? | |
Ans. Electric fields are calculated using the formula: E = k * (Q / r^2), where E represents the electric field strength, k is the electrostatic constant (9 x 10^9 Nm^2/C^2), Q is the charge creating the field, and r is the distance from the charge to the point where the field is being measured.
| 4. What are some real-life applications of electric charges and fields? | |
Ans. Electric charges and fields have various practical applications in our daily lives. Some examples include:
- The functioning of electronic devices such as smartphones, computers, and televisions, which rely on the movement of electric charges.
- The operation of power grids and electrical circuits that distribute electricity to homes and industries.
- Medical applications such as electrocardiography (ECG) and electroencephalography (EEG), which measure the electrical activity of the heart and brain, respectively.
| 5. How do electric charges and fields relate to lightning? | |
Ans. Lightning is a natural phenomenon that occurs when there is a buildup of electric charges in the atmosphere. The separation of positive and negative charges within clouds creates strong electric fields. When the electric field intensity becomes high enough, it can ionize the air molecules and create a conductive path for the discharge of the accumulated charge in the form of lightning.
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