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Question 1 of 5
1. Question
4 pointsIn balanced metre bridge, the resistance of bridge wire is 0.1 Ω / cm. Unknown resistance ‘X’ is connected in left gap and 6 Ω in right gap, null point divides the wire in the ratio 2 : 3. Find the current drawn from the battery of 5 V having negligible resistance. [MHT CET 2016]
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Question 2 of 5
2. Question
4 pointsA potentiometer wire has length 4 m and resistance 8 Ω. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is [CBSE AIPMT 2015]
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Question 3 of 5
3. Question
4 pointsWhen 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 × 10–4 ms–1.
If the electron density in the wire is 8 × 1028 m–3, the resistivity of the material is close to [JEE Main 2015]Correct
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Question 4 of 5
4. Question
4 pointsShown in the figure below is a meter-bridge set up with null deflection in the galvanometer. [AIEEE 2008]
The value of the unknown resistor R isCorrect
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Question 5 of 5
5. Question
4 pointsA thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will [AIEEE 2006]
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