Draw Wheatstone bridge and write the condition for balance.

Figure below shows an unbalanced Wheatstone bridge. What is the direction of conventional current between B and D ?

P, Q, R and S are four resistors of resistances 2, 2, 2 and 3 ohm respectively and are arranged to form a Wheatstone bridge network. Calculate the resistance with which the resistor S must be shunted in order that the bridge may be balanced.

what is interference ? Write the condition for path difference in case of constructive and destructive interference.

Define critical angle. Write two conditions for total internal reflection.

If P, Q, R and S are the resistances in the arms of Wheatstone bridge, then the bridge is most sensitive, when :

Figure shows a Wheatstone bridge circuit. If a current of 2A enters at A, then the current in the arm BC is