To emit an electron from the metal, the minimum electric field required is …..
The phase difference between any two particles in a given wavefront is …..
Cellular phones use radio waves to transmit voice communication in the ……
For a thin prism, if the angle of the prism is \( A \) with a refractive index of 1.6, then the angle of minimum deviation will be …….
A ray coming from an object which is situated at zero distance in the air and falls on a spherical glass surface (\( n = 1.5 \)). Then the distance of the image will be ………. \( R \) is the radius of curvature of a spherical glass.}
For a plane mirror, the focal length is ……..
A parallel plate capacitor with air between the plates has a capacitance of 4 pF. If the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant 6, then the value of capacitance will be ……..
As indicated below, which one is the equation of Ampere-Maxwell law?
For obtaining wattless current,……. is connected with AC supply.}
In an LCR series AC circuit at resonance, the value of power factor will be …….
An inductor of 50.0 mH is connected to a source of 220 V. Then the rms current in the circuit will be ……. . The frequency of the source is 50 Hz.
A coil has \( N \) turns and current passes through it as \( I \) ampere, then we obtain \( L \) Henry of self-inductance. Now if the current changes to 5I, then the new self-inductance will be
The SI unit of the current density is
A short bar magnet placed with its axis at \( 30^\circ \) and a uniform external magnetic field of 0.5 T experiences a torque of magnitude equal to \( 4.5 \times 10^{-2} \) J. Then the magnitude of the magnetic moment of the magnet will be
An ideal ammeter and an ideal voltmeter have resistances of ………… \(\Omega\) and ……
A silver wire has a resistance of 215 \(\Omega\) at 27.5°C and a resistance of 270 \(\Omega\) at 100°C. Then the temperature coefficient of the resistivity of silver will be ……
Vs/Am is the unit of which physical quantity?
Calculate the current in the circuit using Ohm's Law. Given that the voltage across the resistor is V=10 V and the resistance is R = 4
A square loop of side 10 cm and resistance 0.5 \(\Omega\) is placed vertically in the east-west plane. A uniform magnetic field of 0.10 T is set across the plane in the northeast direction. The magnetic field decreases to zero at 0.70 s at a steady rate. Then the magnitude of the induced current during this time interval will be
A solenoid has a core of a material with a relative permeability of 400. The solenoid windings are insulated from the core and carry a current of 2A. If the number of turns is 1000 per meter, then the value of magnetic intensity will be
The magnitude of the drift velocity per unit electric field is known as ………
