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A charged particale accelerated through a P.D. of 100 volt passes throught the uniform electric and magnetic fields so as to experience no deflection. If E = 15 x 10^{6} V m^{1} and B = 5 x 10^{3} T , then the specific charge of the particle is
There is a current of 1.344 amp in a copper wire whose area of crosssection normal to the length of the wire is 1 mm^{2}. If the number of free electrons per cm^{3} is 8.4x10^{22} ,then the drift velocity would be
Power delivered by the source in the circuit is maximum, when
Potential energy of two equal positive charges 1 μ C each held 1 m apart in air is
A spherical shell of radius a with charge Q is expanded to radius b. The work done by the electric force in the process is
Calculate the capacitance C of the capacitor if C_{0} is the capacitance without dielectric
An electric dipole has the magnitude of its charge as q, and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then force acting on it and its potential energy are respectively
The situation is shown in adjacent figure, P → is parallel to E →
∴ U =  pE cos 0 =  pE = Minimum
and the net force on the dipole is zero
Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to the magnetic field ?
The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (velocity of light = 3 x 10^{8} ms^{1}).
The photoelectric threshold of a certain metal is 3000 Å. If the radiation of 2000 Å is incident on the metal
The photoelectrons will be emitted because wavelength of incident radiation is less than threshold wavelength (λ < λ_{0})
Light is incident on a glass plate at an angle of 60^{0}. If reflected and refracted rays are mutually perpendicular, then refractive index of the glass plate is
Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be
The maximum number of possible interference maxima for slitseparation equal to twice the wavelength in Young's doubleslit experiment, is
d sin θ = nλ
If the two slits in Young's experiment have width ratio 1:4, the ratio of intensity at maxima and minima in the interference pattern in
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