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Physics - Current Electricity

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126. Four 20 Ω resistors are connected in series and the combination is connected to a 20 V emf device. The potential difference across anyone of the resistors is (NTSE Rajasthan, Stage-I, 2015-16)

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127. What is the equivalent resistance between any two vertex of a triangle if the sides of the triangle are of equal resistance? (NTSE West Bengal, Stage-I, 2015-16)

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128. Consider a simple circuit containing a battery and three identical incandescent bulbs A, B and C. Bulb A is wired in parallel with bulb B and this combination is wired in series with bulb C. What would happen to the brightness of the other two bulbs if bulb A were to burn out? (NTSE Stage-II,2014-15)

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129. Three different circuits (I, II and III) are constructed using identical batteries and resistors of Rand 2 R ohm. What can be said about current I in arm AB of each circuit?

(NTSE Stage-II, 2014-15)

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130. In the circuit diagram shown below, VA and VB are the potentials at points A and 8 respectively. Then, VA - VB is

(NTSE Stage-II, 2015-16)

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