MEDIUM
12th Haryana Board
IMPORTANT
Earn 100

Calculate electric potential due to a 4×10-7C point charge at a point at a distance 9 cm from it.

Important Questions on Solved Physics Paper-2

MEDIUM
12th Haryana Board
IMPORTANT
Light of wavelength 5000 Å falls on a metal surface of work function 2.01 eV. Find the kinetic energy of photoelectrons. Take: h = 6.62×10-34 Js, c = 3×108 m/s
EASY
12th Haryana Board
IMPORTANT
Explain the difference between terminal voltage and emf of a cell.
MEDIUM
12th Haryana Board
IMPORTANT
A plane electromagnetic wave travels in free space along the X-direction. At a particular point in space the maximum value of  E is 600 volt/meter. What is B at this point (c=3×108 m/s).
MEDIUM
12th Haryana Board
IMPORTANT
What is the ratio of radii of the orbits corresponding to first excited state and ground state in a hydrogen atom?                   
MEDIUM
12th Haryana Board
IMPORTANT
Three resistors 1 Ω, 2 Ω and 3 Ω are combined in series. What is the total resistance of the combination? If the combination is connected to a battery of emf 12 V and negligible internal resistance, obtain the potential drop across each resistor.
MEDIUM
12th Haryana Board
IMPORTANT
A toroid has a core (non-ferromagnetic) of inner radius 25 cm and outer radius 26 cm, around which 3500 turns of a wire are wound. If the current in the wire is 11 A, what is the magnetic field outside the toroid, inside the core of the toroid? Take, μ0 = 4π×10-7 H/m
MEDIUM
12th Haryana Board
IMPORTANT
An ammeter shows that an alternator is delivering 20A. The voltmeter reads 220V, while a watt meter shows that 4 kW of power is being delivered. Find the power factor.
MEDIUM
12th Haryana Board
IMPORTANT
Find the ratio of the radii of circular paths traced by an α particle and beam of proton, entering with equal velocity v in perpendicular magnetic field.