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A 12 V, 60 W lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of 220 V. Assuming the transformer to be ideal, what is the current in the primary winding?
Ideal so power at primary(Pp) is eqaul to power at secondary(Ps)
Ps is 60Watt
Pp= VI where V is 220 Volt so I= 60/220 i.e. 0.27Ampere
The net magnetic flux through any closed surface is ? NEET UG2023
For closed surace (like cube, square, cuboid, cone, spherical shell etc) net magnetic flux is zero.
The work functions of Cesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons? NEET UG 2023
Basic Fact- For photoelctric emission to occur incident radiation must have energy(E) equal to or greater than work function(W) of the material, for given question E exceeds W for Cs only.
If the mass of the bob in simple pendulum is increased to thrice its original mass and its length is made half its original length, then the new time period of oscillation is x/2 times its original time period, what is value of x ? NEET UG 2024
A 10 μF capacitor is connected to a 210 V, 50 Hz source. The peak current in the capacitor will be ? CBSE, NEET, NTA-JEE, CUET
An iron bar of length L has magnetic moment M. It is bent at the middle of its length such that the two arms make an angle 60° with each other. The magnetic moment of this new magnet is? NEET UG2024
A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is ? NEET UG2024
A metallic bar of Young’s modulus, 0.5 ×10^11 N m^–2 and coefficient of linear thermal expansion 10^–5 °C^–1, length 1 m and area of cross-section 10^–3 m^2 is heated from 0°C to 100°C without expansion or bending. The compressive force developed in it is
A wire of length ‘l’ and resistance 100 Ω is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series, Find final resistance.
Properties of an electromagnetic wave travelling in free space.
1.They travel with a speed equal to c.
2.they are transverse in nature.
3. They are originated from accelerated charges.
4.The energy density in electric field is equal to energy density in magnetic field.