Wheatstone bridge and metre bridge
- Choose the correct circuit which can achieve the bridge balance. Answer: 2. circuit (2) Key idea: A Wheatstone bridge is balanced when no current flows through G, i.e. P/Q=R/S . The top arms are 10 Ω and 1... 1
- If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by : Answer: 4. 100 Ω No deflection means no current in the galvanometer branch, so the potential drop across R equals the 2 V cell. Current in t... 1
- A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q : Answer: 3. should be approximately equal and are small A Wheatstone bridge is most sensitive when all four arms have comparable resistance,... 1
- A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1 Ω of the resist… Answer: 2. 1.0×10⁻¹ m Metre bridge balance: X/10=l/100-l=3/2 . X=15\ Ω This 15 Ω is the resistance of the whole 1.5 m wire. Length per ohm:... 1