Physics Test - ...

\(1 kWh =\) ______ \(J\)

In a solar cell, the maximum power obtained when sun light is illuminated on it is 65 mW. The fill factor of the solar cell is 0.65. Which of the following I-V characteristics will represent the above solar cell?

A magnetic needle has magnetic moment \(6.7 \times 10^{-2} \mathrm{Am}^{2}\) and moment of inertia \(I=7.5 \times 10^{-6} \mathrm{~kg} \mathrm{~m}{ }^{2}\). It performs \(10\) complete oscillations in \(6.70 \mathrm{~s}\). What is the magnitude of the magnetic field?

A circuit has a section \({AB}\) as shown in figure. The emf of the source equals \({E}=10 {~V}\), the capacitor capacitances are equal to \({C}_{1}=1.0 \mu {F}\) and \({C}_{2}=2.0 \mu {F}\) and the potential difference \({V}_{{A}}-{V}_{{B}}=5.0 {~V}\). Find the voltage across each capacitor.

Which one of the following is the correct expression for displacement current \(\left(i_{d}\right)\)?

The energy band diagram of a 3 terminal device is shown, the type of junction is:

The potential difference between the two plates of a parallel plate capacitor is constant. When air between the plates is replaced by a dielectric material, the electric field intensity:

If we double the radius of a coil keeping the current through it unchanged, what happens to the magnetic field on its axis at very very far away points?

Which series of hydrogen spectrum corresponds to ultraviolet region?

A solenoid of inductance \(L\) and resistance \(R\) is connected to a battery. The time taken for the magnetic energy to reach \(\frac{1}{4}\) of its maximum value is: