A network of resistors is connected to a 16 V battery with an internal resistance of 1 Ω as shown in the following figure. Compute the equivalent resistance of the network.

OR

A 9 V battery is connected in series with a resistor. The terminal voltage is found to be 8 V. Current through the circuit is measured as 5 A. What is the internal resistance of the battery?

A ray of light is incident on a medium with the angle of incidence ‘i’ and is refracted into a second medium with the angle of refraction ‘r’. The graph of sin i versus sin r is as shown. Find the ratio of the velocity of light in the first medium to the velocity of light in the second medium.

Two particles have equal momenta. What is the ratio of their de-Broglie wavelengths?

OR

Monochromatic light of frequency 6.0x 10¹⁴ Hz is produced by a laser. What is the energy of a photon in the light beam?

The diagram below shows a potentiometer set up. On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left. On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but now by a larger amount. Identify the fault in the circuit and explain, using appropriate equations or otherwise, how it leads to such a one-sided deflection.

OR

Following circuit was set up in a meter bridge experiment to determine the value X of an unknown resistance.

(a)Write the formula to be used for finding X from the observations.

(b) If the resistance R is increased, what will happen to balancing length?

The figure shows two sinusoidal curves representing oscillating supply voltage and current in an AC circuit.

Draw a phasor diagram to represent the current and supply voltage appropriately as phasors. State the phase difference between the two quantities.