A Wheatstone bridge has resistances P and Q in two adjacent arms and R and S in the other two, with the galvanometer joining the junctions of P, Q and R, S. The bridge is balanced when:
A Wheatstone bridge has resistances P and Q in two adjacent arms and R and S in the other two, with the galvanometer joining the junctions of P, Q and R, S. The bridge is balanced when:
In a balanced Wheatstone bridge, the current through the galvanometer is:
In a Wheatstone bridge, P = 10 Ω, Q = 20 Ω and R = 15 Ω. For balance, the fourth resistance S must be:
In a meter bridge, an unknown resistance X is in the left gap and a 3 Ω resistor in the right gap. The null point is at 40 cm from the left end. X is:
In a meter bridge experiment the null point is at l cm from the left end. If the resistances in the left and right gaps are interchanged, the new null point is at:
In a meter bridge, an unknown resistance X in the left gap is balanced against a 6 Ω resistor in the right gap at 40 cm. A 12 Ω resistor is then connected in parallel with X. The new null point is at about:
In a meter bridge experiment, it is preferable to obtain the null point near the middle of the wire because:
A Wheatstone bridge is balanced. If the battery and the galvanometer are interchanged, the bridge:
In a Wheatstone network, each of the four arms has resistance 2 Ω and the galvanometer arm also has resistance 2 Ω. The equivalent resistance between the two points to which the battery is connected is:
In a Wheatstone bridge, P = 2 Ω, Q = 4 Ω and R = 6 Ω. The value of S needed for balance is:
In a meter bridge, the end error arises because:
The wire of a meter bridge is usually made of an alloy such as constantan or manganin because it has:
In a meter bridge, a 10 Ω resistor is in the left gap and an unknown resistance X in the right gap. The null point is at 60 cm from the left end. X is about:
In a Wheatstone network, P = 1 Ω, Q = 2 Ω, R = 2 Ω and S = 4 Ω, and a 5 Ω resistor is connected in the galvanometer arm. The equivalent resistance between the points where the battery is connected is:
In a Wheatstone bridge, P = 5 Ω, Q = 10 Ω and R = 8 Ω. Find the value of S (in ohm) for balance.
In a meter bridge, a 20 Ω resistor is in the right gap. With an unknown resistance in the left gap, the null point is 20 cm from the left end. Find the unknown resistance in ohm.
In a meter bridge, the null point is at 50 cm when resistances X and R are in the left and right gaps. If X is replaced by 3X, find the new position of the null point in cm from the left end.
In a Wheatstone network, each of the four arms has a resistance of 4 Ω and the galvanometer arm has a resistance of 10 Ω. Find the equivalent resistance (in ohm) between the battery terminals of the network.