JEE Main Physics: Current Electricity Practice Questions

26 questions with answers and step-by-step solutions. Tap any question to see the full worked solution.

Q1.
$A wire of resistance 10 ohms is stretched to double its original length. What is the new resistance of the wire?$
Easy
Q2.
$What is the equivalent resistance of two resistors of 2 ohms and 4 ohms connected in series?$
Easy
Q3.
$According to Ohm's law, which of the following relations is correct?$
Easy
Q4.
$A current of 2 amperes flows through a conductor for 10 seconds. What is the total charge that passes through the conductor?$
Easy
Q5.
$What is the power dissipated by a resistor of 5 ohms when a current of 2 amperes flows through it?$
Easy
Q6.
$A wire of resistance 10 ohms is stretched to twice its original length. What is the new resistance of the wire?$
Medium
Q7.
$In a potentiometer experiment, the balancing length for a cell of EMF 1.5 volts is 300 cm. If the cell is replaced by another cell of EMF 2.5 volts, what will b$
Medium
Q8.
$A battery of EMF 12 volts and internal resistance 2 ohms is connected to an external resistor. If the current in the circuit is 2 amperes, what is the value of$
Medium
Q9.
$Three resistors of 2 ohms, 3 ohms, and 6 ohms are connected in parallel. What is the equivalent resistance of the combination?$
Medium
Q10.
$A heater coil is cut into two equal parts and only one part is used in the heater. The heat generated will now be how many times the original heat generated for$
Medium
Q11.
$A w i r eo f l e n g t h L an d cr oss - sec t i o na l a r e a A ha s a r es i s t i v i t y t ha t v a r i es w i t h d i s t an ce x f r o m o n ee n d a sr h o = r h o_{0} (1 + a l p ha x / L) . I f a p o t e n t ia l d i f f er e n ce$
Hard
Q12.
$In a potentiometer circuit, a cell of emf E is balanced by a length l. If the internal resistance of the cell is r and it is shunted by a resistance R, the new$
Hard
Q13.
$A galvanometer of resistance G is shunted by a resistance S. To increase the range of the galvanometer to n times its original value, what should be the value o$
Hard
Q14.
$A battery of emf E and internal resistance r is connected to a variable resistor R. The power delivered to the resistor is maximum when R equals r. What is the$
Hard
Q15.
$In a meter bridge experiment, the balance point is found at 40 cm from the left end. If a resistance of 10 ohms is connected in series with the left resistor, t$
Hard
Q16.
$A wire of resistance 10 ohms is stretched to twice its original length. What will be the new resistance of the wire?$
Medium
Q17.
$A heater coil is cut into two equal parts and only one part is used in the heater. The heat generated will now be how many times the original heat?$
Medium
Q18.
$Three resistors of 2, 3, and 6 ohms are connected in parallel. What is the equivalent resistance of the combination?$
Medium
Q19.
$A battery of emf E and internal resistance r is connected to a variable resistor R. The power delivered to the resistor is maximum when R equals r. What is the$
Hard
Q20.
$A galvanometer of resistance G is shunted by a resistance S. If the current through the galvanometer is 1/n of the total current, what is the value of S?$
Hard
Q21.
$A network of resistors is formed by connecting n resistors each of resistance r in parallel, and then connecting m such groups in series. What is the equivalent$
Hard
Q22.
$A current of 2 amperes flows through a conductor for 10 seconds. How much charge passes through the cross section?$
Easy
Q23.
$What is the unit of electrical resistivity?$
Easy
Q24.
$A wire of resistance 10 ohms is stretched to double its original length. What will be the new resistance of the wire?$
Easy
Q25.
$Which of the following is the correct expression for drift velocity of electrons in a conductor?$
Easy
Q26.
$Two resistors of 2 ohms and 4 ohms are connected in series. What is the equivalent resistance?$
Easy

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