JEE Main · Physics
Generate JEE Main level questions on Current Electricity. Focus on Ohm's law, Kirchhoff's laws, and Wheatstone bridge.
381 questions · 20 PYQs · 0 AI practice · JEE Main 2027
The galvanometer deflection, when key is closed but is open, equals (see figure). On closing also and adjusting to 5W, the deflection in galvanometer becomes . The resistance of the galvanometer is, then, givenby [Neglect the internal resistance of battery]:
In a Wheatstone bridge (see fig.), Resistances P and Q are approximately equal. When R = 400 Ω, the bridge is equal. When R = 400 Ω, the bridge is balanced. On inter-changing P and Q, the value of R, for balance, is 405 Ω. The value of X is close to :
The resistance of the meter bridge AB is given figure is 4Ω. With a cell of emf ε = 0.5 V and rheostat resistance = 2 Ω the null point is obtained at some point J. When the cell is replaced by another one of emf ε = the same null point J is foundfor = 6 Ω. The emf is;
In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 Ω resistor is connected in series with , the null point shifts by 10 cm. The resistance that should be connected in parallelwith ( + 10) Ω such that the null point shifts back to its initial position is
A galvanometer having a resistance of 20 Ω and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :-
A resistance is shown in the figure. Its valueand tolerance are given respectively by: [9-Jan-2019 Shift 1]
In the given circuit diagram, the currents, = -0.3A, = 0.8 A and = 0.4 A, are flowing as shown. The currents and ,respectively, are :
A uniform metallic wire has a resistance of 18 Ω and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is :
Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 ,is v. If the electron density in copper is 9 × / the value of v in mm/s is close to (Take charge of electron to be = 1.6 × C) [9-Jan-2019 Shift 1]
A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when:
A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is , how long will the charges take to travel a distance d ?
A constant voltage is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be :
In the given circuit all resistances are of value R ohm each. The equivalent resistance between A and B is :[Main 15 April 2018 S1]
A galvanometer with its coil resistance 25 Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read up to a current of 2 A, the approximate value of the shunt resistance should be :[Main 16 April 2018 S1]
In a meter bridge, as shown in the figure, it is given that resistance and that the balance is obtained at a distance 39.5 cm from end A (by Jockey J). After interchanging the resistances X and Y, a new balance point is found at a distance from end A. What are the values of X and ?[Main 15 April 2018 S1]
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52cm of the potentiometer wire. If the cell is shunted by a resistance of 5Ω , a balance is found when the cell is connected across 40cm of the wire. Find the internal resistance of the cell.[Main 8 April 2018]
A heating element has a resistance of 100 Ω at room temperature. When it is connected to a supply of 220V, a steady current of 2 A passes in it and temperature is 500°C more than room temperature.What is the temperature coefficient of resistance of the heating element ?[Main 16 April 2018 S1]
On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10cm. The resistance of their series combination is 1kΩ. How much was the resistance on the left slot before interchanging the resistances ?[Main 8 April 2018]
In a circuit for finding the resistance of agalvanometer by half deflection method,a 6 V battery and a high resistance of 11 kΩ are used. The figure of merit of the galvanometer is 60µA/division. In the absence of shunt resistance, the galvanometer produces a deflection of θ=9 divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of θ/2, is closest to :[Main 16 April 2018 S1]
Two batteries with e.m.f. 12V and 13V are connected in parallel across a load resistor of 10Ω . The internal resistances of the two batteries are 1Ω and 2Ω respectively. The voltage across the load lies between :[Main 8 April 2018]
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