Current Electricity — Physics STD 12 Science — Question

To which part of the electromagnetic spectrum does a wave of frequency 3 x 10¹³ Hz belong?

A charge 'q' is moved from a point A above a dipole of dipole moment 'p' to a point B below the dipole in equatorial plane without acceleration. Find the work done in the process.

On a winter day the temperature of the tap water is 20°C whereas the room temperature is 5°C. Water is stored in a tank of capacity 0.5m³ for household use. If it were possible to use the heat liberated by the water to lift a 10kg mass vertically, how high can it be lifted as the water comes to the room temperature? Take g = 10m s^-2.

A conducting loop is held below a current carrying wire PQ as shown. Predict the direction of the induced current in the loop when the current in the wire is constantly increasing.

Two charges of magnitudes – 2Q and + Q are located at points (a, 0) and (4a, 0) respectively. What is the electric flux due to these charges through a sphere of radius ‘3a’ with its centre at the origin?

What will have the effect of moving the plates of a charged capacitor away from each other, on the potential difference between the plates?

Define ‘quality factor’ of resonance in series LCR circuit. What is its SI unit?

Special devices, like the klystron valve or the magnetron valve, are used for production of electromagnetic waves. Name the waves and also write one of their applications.

What is the magnitude of electromotive forces of batteries used in any closed electric circuit?