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qUESTIONS

A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points A and B as shown in the figure, is [2009]

A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rn are connected as shown in the figure below. The current I in the circuit is

A primary cell has an e.m.f. of 1.5 volt, when short-circuited it gives a current of 3 ampere. The internal resistance of the cell is

In Wheatstone’s bridge P = 9 ohm, Q=11ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge

AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20 cm and CB = 80 cm. The resistance R is equal to

In a balanced Wheatstone’s network, the resistances in the arms Q and S are interchanged. As a result of this

In the Wheatstone’s bridge (shown in figure) X=Y and A> B. The direction of the current between ab will be

In the circuit shown, a meter bridge is in its balanced state. The meter bridge wire has a resistance 0.1 ohm/cm. The value of unknown resistance X and the current drawn from the battery of negligible resistance is

The resistance in left and right gap of a meter bridge are 20Ω and 30Ω, respectively. When the resistance in the left gap is reduced to half its value, then balance point shifts by

In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is

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