Physics Test - ...

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux \(\varphi\) linked with the primary coil is given by \(\varphi=\varphi_{0} 4 \mathrm{t},\) where \(\varphi\) is in webers, t is time in second and \(\varphi_{0}\) is a constant, the output voltage across the secondary coil is

The work done in placing a charge of 8×10⁻¹⁸ coulomb on a condenser of capacity 100 micro-farad is:

Consider a capacitor-charging circuit. Let Q₁ be the charge given to the capacitor in a time interval of 10 ms and Q₂ be the charge given in the next time interval of 10 ms. Let 10μC charge be deposited in a time interval t₁ and the next 10μC charge be deposited in the next time interval t₂ :

Four identical capacitors are connected in series with a 12 V battery as shown in figure. The potentials of points A and B are :

A parallel plate air capacitor is connected to a battery. The quantities charge, voltage, electric filed and energy associated with this capacitor are gives by Q₀,V₀,E₀ and U₀ respectively. A dielectric slab is now introduced to fill the space between the plates with the battery still in connection. The corresponding quantities are now given by Q, V, E and U are related to the previous one as:

Which of the following factors do not influence the capacity of a capacitor?

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be :

In the circuit diagram shown all the capacitors are in μF. The equivalent capacitance between points A and B is (in μF):