Physics Test - ...

A capacitor of capacitance 5μF is charged to a potential difference of 20V. After that, it is connected across an inductor of inductance 0.5 mH. What is the current flowing in the circuit at a time when the potential difference across the capacitor is 10 V?

A circuit element 'X' when connected to peak voltage of 200 V, a peak current of 5A flows which lags behind the voltage by π/2. A circuit element Y when connected to same peak voltage, same peak current flows which is in phase with the voltage. Now X and Y are connected in series with same peak voltage. The rms value of current through the circuit will be:

The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, then focal length of lens will be:

A boy of height 1 m stands infront of a convex mirror. His distance from the mirror is equal to the focal length of the mirror, the height of the image is :

What will be the wavelength of electrons if its accelerated by potential difference of 2 V

A charge of 0.2 C moves with a velocity  in a uniform magnetic field of B = 5 k̂T. What is the magnetic force experienced by the charge?

The average e.m.f. during the positive half cycle of an A.C. supply of peak value E₀ is:

Which of the following is true about equipotential lines?

In electrolytic capacitors positive terminal is ________

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is