Light emitted during the de excitation of electron from n=3 to n=2, when incident on a metal, photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect is not […]
In R-L-C series circuit, the potential differences across each element is 20 V. Now the value of the resistance alone is doubled, then PD across R,L and C respectively.
Options
(a) 20 V, […]
For a transformer, the turns ratio is 3 and its efficiency is 0.75. The current flowing in the primary coil is 2A and the voltage applied to it is 100 V. Then the voltage and […]
Which of the following phenomena support the wave theory of light? 1. Scattering 2. Interference 3. Diffraction 4. Velocity of light in a denser medium is less than the velocity of light in the rare […]
A series combination of resistor (R), capacitor (C), is connected to an AC source of angular frequency ω. Keeping the voltage same, if the frequency is changed to ω/3, the current becomes half of the […]
A charged particle with a velocity 2×10³ ms⁻¹ passes undeflected through electric field and magnetic fields in mutually perpendicular directions. The magnetic field is 1.5T. The magnitude of electric field will be
Options
Electromagnetic induction is not used in
Options
(a) speedometer (b) transformer (c) AC generator (d) room heater
Correct Answer:
room heater
Explanation:
No explanation available. Be the first to write the explanation for […]
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