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PhysicsClass 1CBSE

We wash clothes in the ABTHRMOO_______

We wash clothes in the bathroom.

PhysicsClass 10CBSE

What is Zener voltage?

Zener voltage (V_Z) is the specific reverse voltage at which a Zener diode begins conducting in the reverse direction while maintaining a nearly constant voltage.Below V_Z: diode blocks current.At/above V_Z: current flows freely in reverse, voltage stays constant at V_Z.This voltage-clamping behaviour = ideal voltage regulators.Common val

PhysicsClass 10CBSE

What is magnetic induction?

Magnetic induction (B) measures the strength of a magnetic field specifically, the force per unit current per unit length on a conductor in the field.Symbol: B | Unit: Tesla (T)Vector quantity.Formula: B = F / (IL)Earth's

PhysicsClass 10CBSE

What is electromagnetic induction?

Electromagnetic induction is the generation of EMF in a conductor when the magnetic flux through it changes. Discovered by Michael Faraday in 1831.Faraday's Law: EMF = −dΦ/dt (negative sign = Lenz's Law — induced current opposes change)Applications: Electric generators, transformers, electric motors, induction cooktops, microphones.Electromagnetic induction is the generation of EMF/current by a changing magnetic field the foundational pri

PhysicsClass 10CBSE

What are eddy currents? Write two applications.

Eddy currents are loops of electrical current induced within a conductor by a changing magnetic field (Faraday's Law), flowing in closed circular paths.Oppose the change causing them (Lenz's Law).Generate heat (core losses in transformers — minimised by laminating cores).Two Major Applications:<li data-list-item-id="e989e415d772

PhysicsClass 10CBSE

How do you calculate current through a 6-ohm resistor using Ohm's law?

Ohm's Law: I = V / RExample (V = 12 V, R = 6 Ω): I = 12 / 6 = 2 AIf V = 6 V: I = 6 / 6 = 1 AMemory aid (Ohm's Law triangle): [ V ] ------- I | R Cover the unknown to find the formula.Current through any resistor is found using I = V/R; for a 6-ohm resistor at 12 V, the current is 2 amperes.

PhysicsClass 10CBSE

What is an electric field?

An electric field is the region around a charged object where another charged object experiences a force.Formula: E = F/q (in N/C or V/m)Vector quantity — direction from + to − charges.Field lines drawn from + to −, never cross, perpendicular to conductor surface.For a point charge: E = kQ/r² (k = 9 × 10⁹ N m²/C²

PhysicsClass 10CBSE

What is an electric fuse and how does it work?

An electric fuse is a short piece of thin wire with a low melting point, connected in series to protect circuits from overcurrent.How it works:Normal conditions → current flows without significant heating.Excess current (short circuit/overload) → fuse wire heats rapidly.Wire

PhysicsClass 10CBSE

What is electromotive force?

EMF (ε) is the total energy supplied by a source per unit charge as it drives charge around a complete circuit.Unit: Volt (V) not a force, it is energy per charge.EMF = maximum terminal voltage when no current flows (open circuit).EMF vs. Terminal Voltage: Terminal Voltage = EMF − I × r (internal resistance)</

PhysicsClass 10CBSE

What is electric potential difference?

Electric potential difference (voltage) between two points is the work done per unit positive charge in moving it from one point to another.Formula: V = W/q or V_AB = V_A − V_BDrives current through a circuit.Measured by a voltmeter connected in parallel.1 Volt = 1

PhysicsClass 10CBSE

What is electric potential?

Electric potential at a point is the work done per unit positive charge in bringing a test charge from infinity to that point.Formula: V = W/q (in Volts)Scalar quantity.1 Volt = 1 Joule / 1 Coulomb.Analogous to "height" in a gravitational landscape higher potential = higher positi

PhysicsClass 10CBSE

What is an electric circuit?

An electric circuit is a closed, continuous conducting path through which current flows from a source to the load and back.Essential components: Source (battery), conducting wires, load (bulb/resistor), switch.TypeDescriptionSeriesSingle path same current, voltage dividesParallelMultiple paths same voltage, current divides</tab

PhysicsClass 10CBSE

Why does steam cause more severe burns than boiling water?

Steam causes more severe burns because it carries extra energy the latent heat of vaporisation.Both are at 100°C, but when steam contacts skin, it first condenses, releasing 2260 kJ/kg, then cools from 100°C.Boiling water only releases energy from cooling from 100°C to body temperature.The extra 2260 kJ/kg from condensation is enormous this is why steam burns are medically more serious.Steam burns are worse than boiling water burns because steam releases additional

PhysicsClass 10CBSE

What is latent heat?

Latent heat is the energy absorbed or released during a change of state at constant temperature it goes into breaking/forming intermolecular bonds, not increasing temperature.TypeChangeFor WaterLatent heat of fusion (Lf)Solid ↔ Liquid334 kJ/kgLatent heat of vaporisation (Lv)Liquid ↔ Gas2260 kJ/kgF

PhysicsClass 10CBSE

What is atmospheric pressure?

Atmospheric pressure is the pressure exerted by the weight of the air column above any surface.At sea level: 1 atm = 101,325 Pa = 760 mm HgMeasured by a barometer.Decreases with altitude less air above = less weight = less pressure.Everyday effects: Drinking throug

PhysicsClass 10CBSE

What is the difference between mass and weight?

FeatureMassWeightDefinitionQuantity of matterGravitational force on massTypeScalarVectorFormula—W = mgUnitKilogram (kg)Newton (N)Constant?AlwaysChanges with gMeasured byBeam balanceSpring balance</

PhysicsClass 10CBSE

What is distance in physics?

Distance is the total length of the path travelled by an object, regardless of direction. It is a scalar quantity always positive.FeatureDistanceDisplacementTypeScalarVectorDirectionNoYesCan be negative?NoYesExample: Walk 4 km east and 3 km north → Dist

PhysicsClass 10CBSE

What is Newton's second law of motion?

Newton's Second Law: The rate of change of momentum is directly proportional to the net applied force and acts in its direction.The famous equation: F = maF = net force (N), m = mass (kg), a = acceleration (m/s²)Bigger force → more acceleration; bigger mass → less acceleration.Derivation: F = d(m

PhysicsClass 10CBSE

What is Newton's first law of motion?

Newton's First Law (Law of Inertia): An object at rest stays at rest, and an object in motion stays in uniform motion in a straight line, unless acted on by an external unbalanced force.Inertia: The natural tendency to resist any change in motion state.Real-life examples: Book lying on a table; passengers lurching forward when a bus brakes; dust flying off a beaten carpet.Newton's First Law says objects resist any change in their motion s

PhysicsClass 10CBSE

What is a conservative force?

A conservative force does work independent of the path taken only initial and final positions matter. Work done over a closed path is always zero.Examples of Conservative Forces: Gravitational, electrostatic, spring force.Non-conservative: Friction, air resistance (always dissipate energy as heat).A conservative force does path-independent work and is associated with potential energy gravity and electrostatic force are the most common exa

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