Electric and magnetic Fields

charge of an electron

• 1.6 x 10^-19 C

• 1.8 x 10^-19 C

• 1.6 x 10^-20C

• 1.6 x 10^20C

Answer explanation

... Charge is the one of the 7 fundamental quantities.

... Coulumb is the fundamental Unit

What is quantisation of Charge?

• Charge Seperation

  Q-q

• Charge Density

  Q/V

• Total charge on the surface of a charged object is always integral multiple of base charge

  Q = ne

• Charge Flux

  Q/A

Answer explanation

The elementary charge e = 1.6 times 10^-19 C is so tiny that one single coulomb of charge contains approximately 6.25 quintillion electrons — that’s 6,250,000,000,000,000,000 electrons!

So, the next time you rub a balloon on your hair and create static electricity, you’re actually moving billions upon billions of electrons — all thanks to the quantization of charge! ⚡🎈

......................is the process of creating or inducing an electric charge on a conductor or an insulator by bringing it into the influence of a charged object without direct contact

• Electrostatic conduction

• Electric charging

• Electrostatic insulation

• Electrostatic induction

Answer explanation

The process shown here is called charging by induction—and here’s the cool part:

You can charge an object without even touching it! 😲

Just like a magician pulling off a trick, bringing a charged rod near the sphere causes electrons inside the sphere to move—even though the rod never makes contact. It’s like an invisible force (aka electrostatic influence) rearranging the charges behind the scenes! ✨⚡

Electricity: making things move… without touching them. Now that’s science magic! 🧲🪄

F= kQq/r^2, where F =................., Qq=..................., and r=......................

• F= Coulomb's force or electric force

  Qq= product of magnitudes of two individual charges

  r= separation between the charges

• F= electromagnetic force

  Qq= product of magnitudes of two individual charges

  r= separation between the charges

• F= Coulomb's force or electric force

  Qq= quantisation of two individual charges

  r= separation between the charges

• F= Coulomb's force or electric force

  Qq= product of magnitudes of two individual charges

  r= radius of the spherical charge

Answer explanation

Coulomb’s Law is like the invisible handshake between charged particles! 🤝⚡

And here’s the fun twist—the electrostatic force between two electrons is about 10³⁹ times stronger than the gravitational force between them! 😮 That means electricity totally dominates gravity at the atomic level. So next time you rub a balloon on your head and it sticks to the wall, just remember: it’s not magic—it’s Coulomb flexing his electrostatic muscles! 💪🔋✨

which of the below expression is the right equation for electric field or electric field strength?

• E= F^Q

• E = F x Q

• E = F/ Q

• E= F + Q

Answer explanation

Electric fields are invisible—but they’re always around us! ⚡🧲

Even your body creates electric fields when your nerves send signals to your brain or muscles. And here’s the cool part: a single proton’s electric field can influence another charge from several meters away—without ever making contact! So the next time you get a tiny zap from a doorknob, remember: you’re experiencing the work of an electric field in action… tiny, invisible, but mighty! 💥👆

Electric field between two charged parallel metal plates?

• E = V^d

• E= V/d

• E= d/V

• E= dxV

Answer explanation

A uniform electric field between two parallel

Fun Fact:

The space between two charged parallel plates acts just like a mini electric field “treadmill”—it’s perfectly uniform, meaning a charged particle experiences the same force everywhere between the plates! ⚡👟

This concept is used in particle accelerators and even in your TV screens (CRT displays) from the past—where electrons were steered and accelerated using these exact kinds of uniform electric fields. So yes, your old TV had its own electric racetrack inside! 📺💨

The electric field strength is zero at a point on the line joining two-point charges. Which of the following must be true at that point?

• The magnitudes of the two charges are equal.

•  The point lies exactly midway between the two charges.

• The electric field vectors due to both charges are equal in magnitude and opposite in direction.

• The net electric potential at that point is also zero.

Answer explanation

🔌 Fun Fact:

Electric fields don’t just care about how much charge there is—they care where it is and what kind it is! ⚡

In the top two diagrams, the fields from two like or unlike charges cancel out perfectly at a point between them. But the moment you switch to opposite charges, like in the bottom diagram, their fields reinforce each other instead of cancelling. That’s because electric field vectors always point away from positive charges and toward negative charges—so their directions matter just as much as their magnitudes! 🧠📐

It’s like teamwork: sometimes forces push in opposite directions and cancel, sometimes they push together—and things really start moving! 💥✨

Which of the following is the most fundamental source of a magnetic field?

• The mass of an object

• The mass of an object

• The temperature of a conductor

• The motion of electric charges

Answer explanation

🧠 Explanation: Magnetic fields are created by moving electric charges — whether in a current-carrying wire or orbiting electrons in atoms.

Which statement correctly describes the direction of magnetic field lines around a bar magnet?

• They flow from south to north inside the magnet and outside as well.

• They flow in closed loops from north to south inside and outside the magnet.

• They emerge from the south pole and end at the north pole.

• They emerge from the north pole and re-enter at the south pole, forming closed loops.

Answer explanation

🧲 Fun Fact:

Magnetic field lines always form closed loops—they never start or stop like electric field lines do!

That means the field flows from the north pole to the south pole outside the magnet, and from south to north inside the magnet—like an endless magnetic racetrack! 🏁

So technically… a magnetic monopole (a single magnetic pole) has never been found in nature—magnetic poles always come in pairs! Even if you cut a magnet in half, you just get two smaller magnets, each with its own north and south. 🔍✂️🧲

A straight wire carries current vertically upward. What is the direction of the magnetic field lines around the wire?

• Outward in all directions from the wire

• Circular, in clockwise direction when viewed from above

• Circular, in counterclockwise direction when viewed from above

• Straight lines parallel to the wire

Answer explanation

🧲 Fun Fact:

The diagram shows Ampere’s Right-Hand Grip Rule—but here’s the cool twist: your hand becomes a magnetic compass! 🧭✋

Just wrap your right hand around a wire with your thumb pointing in the direction of the current, and your curled fingers magically show the direction of the magnetic field around the wire!

So next time someone asks, “Which way do magnetic fields flow?”—just say, “Let me give you a hand!” 😄🧲💡