JEE/ NEET | Physics | Current Electricity | MCQ | Lecture 10

00:00 7. Two batteries of e.m.f. 4 V and 8 V with internal resistances 1 Ω and 2 2 are connected in a circuit with a resistance of 9 Ω as shown in figure. The current and potential difference between the points P and Q are
01:50 11. In the circuit element given here, if the potential at point B, VB = 0, then the potentials of A and D are given as
12:03 12. A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be
15:30 13. 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
18:42 14. 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
22:50 Different Measuring Instruments 1.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
29:05 2. 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
31:15 3. In a balanced Wheatstone's network, the resistances in the arms Q and S are interchanged. As a result of this
33:05 4. In the Wheatstone's bridge (shown in figure) X=Y and A B. The direction of the current between ab will be
43:14 5. 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
47:43 6. 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
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