# AP EAMCET PHYSICS CURRENT ELECTRICITY ONLINE EXAM

#### . In a meter bridge a resistance is connected in the left gap and a pair of resistances P and Q in the right gap. Measured from the left, the balance point is 37.5 cm when P and Q are in series and 71.4 cm when they are parallel. The values of P and Q (in) are

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#### Two cells A and B are connected in the secondary circuit of a potentiometer one at a time and the balancing length are respectively 400cm and 440 cm. The e.m.f. of the cell A is 1.08 volt. The e.m.f. of the second cell B in volts is

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#### In a potentiometer experiment, the balancing length with a cell is 560 cm. When an external resistance of 10 ohm is connected in parallel to the cell the balancing length changes by 60cm. The internal resistance of the cell in ohms is

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#### Two resistances of 400Ω and 800Ω are connected in series with 6 volt battery of negligible internal resistance. A voltmeter of resistance 10,000Ω is used to measure the potential difference across 400Ω. The error in the measurement of potential difference in volt approximately is

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#### . The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10 is connected in parallel to the cell the balancing length changes by 60 cm. The internal resistance of the cell in ohms is

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Wrong!

#### Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1: 2 and if no resistance value is fractional, the largest of the three resistances in ohms is

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#### In potentiometer experiment a cell of e.m.f. 1.5 V connected in the secondary circuit gives a balancing length of 165cm of the wire. If a resistance of 5 is connected parallel to the cell, the balancing length of the wire is 150cm. The internal resistance of the cell is

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#### Three equal resistances each of 3 are in series and connected to a cell of internal resistance one ohm. If these resistances are in parallel and connected to the same cell, then the ratio of the respective currents through the electric circuits in the two cases is

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#### The sides of a rectangular block are 2cm, 3cm and 4cm. The ratio of the maximum to minimum resistance between its parallel faces is

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#### . A 6V cell with 0.5 Ω internal resistance, a 10V cell with 1 Ω internal resistance and a 12 Ω external resistance are connected in parallel. The current (in amperes) through the 10V cell is

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#### Twelve cells, each having e.m.f. ‘E’ volts are connected in series and are kept in a closed box. Some of these cells are wrongly connected with positive and negative terminals reversed. This 12 cell battery is connected in series with an ammeter, an external resistance ‘R’ ohms and a two-cell battery (two cells of the same type used earlier, connected perfectly in series). The current in the circuit when the 12-cell battery and 2-cell battery aid each other. Then the number of cells in 12-cells battery that are connected wrongly is

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#### One end each of a resistance ‘r’ capacitance C and resistance ‘2r’ are connected together. The other ends are respectively connected to the positive terminals of the batteries P, Q, R having respectively e.m.f. s E, E and 2E. The negative terminals of the batteries are then connected together. In this circuit, with steady current the potential drop across the capacitance is:

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#### The current in a circuit containing a battery connected to 2Ω resistance is 0.9 A. When a resistance of 7Ω connected to the same battery, the current observed in the circuit is 0.3A. Then the internal resistance of the battery is

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#### Two unknown resistance X and Y are connected to left and right gaps of a meter bridge and the balancing point is obtained at 80 cm from left. When a 10Ω resistance is connected in parallel to X, the balancing point is 50 cm from left. The values of X and Y respectively are

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eamcet physics