12 | MHT-CET | Physics | Current Electricity | Lecture 2

00:15 12. To determine the internal resistance of a cell by using a potentiometer the null point is at 1 m when the cell is shunted by 3 Ω resistance and at a length 1.5 m. When cell is shunted by 6 Ω resistance, the internal resistance of the cell is: [MHT-CET 2022]
08:30 13. The resistance in the left and right gaps of a meter bridge are 10 Ω and 30 Ω respectively. If the bridge is balanced, then the distance of the null point from the centre of the wire is: [MHT-CET 2022]
10:25 14. The length of a potentiometer wire is 'L'. A cell of e.m.f. 'E' is balanced at a length 'L/3' from the positive end of the wire. If the length of the wire is increased by 'L/2' at what distance will the same cell gives a balance point? [MHT-CET 2022]
13:20 15. A galvanometer of resistance 'G' is shunted by a resistance of 5Ω. To keep the main current in the circuit unchanged, the resistance to be put in series with the same galvanometer is:
[MHT-CET 2022]
19:45 16. The resistances in the left and right gap of a balanced metre bridge are 12 Ω and 36 Ω respectively. If the resistances are interchanged, the balance point shifts by : [MHT-CET 2022]
20:32 18. When a galvanometer is shunted by a resistance 's', its current capacity increases 'n' times. When the same galvanometer is shunted by another resistance s', its current capacity increases n' times. The expression of n terms of s, s' and n' is : [MHT-CET 2022]
31:25 19. The resistances in the left gap and right gap of a metre bridge are 30 Ω and 70 Ω respectively. If the bridge is balanced, then the distance of the null point from the centre of the wire is : [MHT-CET 2022]
32:46 20. 10 metre long uniform wire of resistance 2 Ω per metre is connected in series with a battery of e.m.f. 3 V and a resistance 10 Ω. The potential gradient along the wire in V/m is: [MHT-CET 2022]
35:50 21. Two unknown resistances are connected in two gaps of a meter bridge. The null point is at 25 cm from zero end. A resistance of 20 Ω is connected in series with the smaller of the two. The null point shifts to 50 cm. The smaller resistance is (in Ω) : [MHT-CET 2023]
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