Chapter Test: Current Electricity - 1 JEE Physics Free MCQs

The current i in the circuit (see figure) is –

The equation for an instantaneous current in a material is given by i = 5e^–t (A). Calculate the amount of total charge flown through the material during the time interval t₁ = 0 s to t₂ = ∞ s –

A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance of –

A wire of length L and 3 identical cells of  negligible internal resistances are connected in series Due to the current the temperature of the wire is raised by ΔT in a time t. A number N of similar cells is now connected in series with a wire of the same material and crosssection but of length 2L. The temperature of the wire is raised by the same amount ΔT in the same time t. The value of N is –

​

Figure shows three resistor configurations R₁, R₂ and R₃ connected to 3V battery. If the power dissipated by the configuration R₁, R₂ and R₃ is P₁, P₂ and P₃, respectively, then

In the circuit shown in figure reading of ideal voltmeter is V₁ when only S₁ is closed, reading of ideal voltmeter is V₂ when only S₂ is closed and reading of this voltmeter is V₃ when both S₁ and S₂ are closed. Then -

ABCD is a square where each side is a uniform wire of resistance 1Ω. A point E lies on CD such that if a uniform wire of resistance 1Ω is connected across AE and  constant potential difference is applied across A and C then B and E are equipotential then select correct option B -

In circuit, if no current flows through the galvanometer when the key K is closed, the bridge is balanced. The balancing condition for bridge is -

A charged capacitor is allowed to discharge through a resistor by closing the key at the instant t = 0. At the instant t = (In 4) μs, the reading of the ammeter falls half the initial value. The resistance of the ammeter is equal to –

The space between two concentric metallic spheres of radii R₁ and R₂ is filled with a material of conductivity σ . The total resistance of the system is –

A capacitor is charged by connecting a battery of emf E and internal resistance r, at t = 0. If at an instant t, potential difference across the capacitor be V and heat generated upto that instant be H, then which of the following graphs is correct -

A network of nine conductors connects six points A, B, C, D, E and F as shown below. The digits denote resistances in Ω. Find the equivalent resistance between B and C -

Direction of the conventional current

Kirchhoff’s second law is a consequence of

A battery is connected with a potentiometer wire. The internal resistance of the battery is negligible. If the length of the potentiometer wire of the same material and radius is doubled then

In a meter bridge experiment a balance point is obtained at a distance of 60 cm from the left end when unknown resistance R is in a left gap and 8 ohms resistor is connected in the right gap. When the position of R and 8 ohm resistor is interchanged the balance point will be at distance of

A Wheatstone bridge is balanced for four resistors R1, R2, R3 and R4 with a Lech lanche cell between A and C and a galvanometer between B and D. The positions of the cell and the galvanometer are interchanged. The balance will