Question

The end error of a meter bridge can be generated due to which of the following causes/(s)
A. Generation of heat due to the flow of current in the wire may change the length of the wire
B. Due to the change of the weather, the length of the meter bridge wire may change its length.
C. The meter bridge wire is mounted over the wooden play some metal screw or some metal
D. The thickness of the wire may be non-uniform.

Answer 1

End error in the meter bridge is found when the zero mark of the scale provided along the bridge wire do not start from the position where the bridge wire leaves the copper strip and the 100 cm mark of the scale is not remains at its position where the bridge wire just touches the other copper stripe.

Complete step by step answer:

Since the meter bridge is mounted on the wooden paltry with the help of some metal screw or some metals and the copper wires are coiled in the connection at the circuit under the metallic stripes then these metal screws and the additional metal stripes in the circuit will result in the rise of the resistance in the meter bridge circuit. This increase in the resistance will give a slight error in the reading of the meter bridge circuit.
So, this end error is due to the reason that the meter bridge wire is mounted over the wooden plate, some metal screws or some metal.
Hence option (C) is the correct answer.

Note:
One more reason to occur the end errors in the meter bridge will be there when the resistance of the copper stripes of the meter bridge and the resistance of the connecting wires is not taken into account. These errors can be corrected or these end errors can be removed also. The end errors can be removed if we repeat the experiment by interchanging the known resistance and unknown resistance and finally, we take the mean value of all the readings obtained in different repeated experiments.