JEE Main Current Electricity — practice questions
120 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Current Electricity in the app →A circuit contains a single loop with one source and several elements as shown. Why does the sum of the listedWhich statement best describes the sign convention used when applying Kirchhoff's Voltage Law to a loop?In the current-junction figure, suppose $I_1$, $I_2$, and $I_3$ are entering the node while $I_4$, $I_5$, and Which pair correctly matches the law with its physical basis?A student traverses a closed loop and adds all voltage rises and drops with proper signs. If the final sum is If $V_1=1\,\text{V}$, $V_2=2\,\text{V}$, $V_3=1\,\text{V}$, $V_4=3\,\text{V}$, $V_5=2\,\text{V}$, $V_6=1\,\texFrom the loop equation $V_1+V_2+V_3+V_4+V_5+V_6+V_7-V_s=0$, the source voltage is equal toIn the loop shown in the figure, which expression matches Kirchhoff's Voltage Law as printed in the notes?
Three resistors of $2\,\Omega$, $4\,\Omega$ an
In the Wheatstone bridge shown above, $P = 4\,Three identical resistors, each of resistance $R$, are connected in **parallel**. The equivalent resistance is
$n$ identical cells, each of EMF $E$ and interA $10$-m-long potentiometer wire of uniform resistance is connected to a $6$-V battery (and no other resistancThe SI unit of electric current is:The current I is related to charge q and time t by:Electric current is a:Ohm's law states V = ___ ?The SI unit of resistance is:For resistors in series, the equivalent resistance is:For resistors in PARALLEL, the equivalent resistance is given by:Kirchhoff's Current Law (KCL) is based on conservation of:Kirchhoff's Voltage Law (KVL) is based on conservation of:A galvanometer can be CONVERTED to an ammeter by:Find the equivalent resistance of 2 Ω and 3 Ω connected in SERIES:Find the equivalent resistance of 6 Ω and 3 Ω in PARALLEL:A battery with emf 12 V and internal resistance 1 Ω drives 2 A current. Find terminal voltage V:Resistance R of a conductor is proportional to:Two resistors 4 Ω and 12 Ω are in parallel; this combination is in series with 8 Ω. Total resistance:Drift velocity v_d is given by:In a Wheatstone bridge, BALANCE condition gives:A 2 Ω, 4 Ω and 6 Ω resistor are in parallel. Equivalent resistance:To convert a galvanometer to a VOLTMETER, connect:Three cells of emf 2 V each, internal resistance 0.5 Ω each, are connected in series. Total emf and internal rThree identical cells with emf 1.5V and internal resistance 0.6 Ω each are connected in parallel. Find equivalIf a wire of resistance R is cut into 4 equal parts and joined in parallel, the new resistance is:A potentiometer is a NULL device used to:A 10 V battery is connected across a 5 Ω resistor. The current through the resistor is:Specific resistivity (ρ) of a conductor depends mainly on:An ammeter has 0.1 Ω resistance and 1 mA full-scale current. The shunt needed to extend range to 1 A:In a Wheatstone bridge: P = 4Ω, Q = 8Ω, R = 6Ω. For balance, S =Five identical bulbs are connected in series across an emf of 100V. Each bulb has resistance 5 Ω. Find total cA 12V battery (internal r = 0.5 Ω) drives current through 5.5 Ω external load. Find power dissipated in EXTERNA copper wire of length 1 m and cross-section 1 mm² has resistivity 1.7 × 10⁻⁸ Ω·m. Its resistance is:Two batteries with emf E₁ = 4V (r₁ = 1Ω) and E₂ = 6V (r₂ = 2Ω) in parallel. Find equivalent emf:A wire of resistance 10 Ω is stretched to double its length without changing volume. Its new resistance:In a circuit, drift velocity of electrons is 10⁻⁴ m/s. Number density of free electrons is 10²⁹ /m³. Charge peMaximum power transfer from a source occurs when external resistance equals:In a meter bridge experiment, the null point divides the wire as 30 cm and 70 cm. If known resistance is 6 Ω,