Assertion : The current density $\vec J$ at any point in ohmic resistor is in direction of electric field $\vec E$ at that point.
Reason : A point charge when released from rest in a region having only electrostatic field always moves along electric lines of force.
AIIMS 2016, Medium
Download our app for free and get started
From relation $\vec J = \sigma \,\vec E$, the current density $\vec J$ at any point in ohmic resistor is in direction of electric field $\vec E$ at that point. In space having non-uniform electric field, charges released from rest may not move along $ELOF$. Hence Assertion is correct while Reason is incorrect.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1Four resistances $10$ $\Omega$, $5$ $\Omega$, $7$ $\Omega$ and $3$ $\Omega$ are connected so that they form the sides of a rectangle $AB$, $BC$, $CD$ and $DA$ respectively. Another resistance of $10$ $\Omega$ is connected across the diagonal $AC$. The equivalent resistance between $A$ and $B $ is .............. $\Omega$View Solution
- 2The equivalent resistance of the given circuit between the terminals ${A}$ and ${B}$ is $....\Omega$View Solution
- 3The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of $2 \,\Omega$. The value of internal resistance of each cell is ............ $\Omega$View Solution
- 4A current of $10\, amp$ is passing through a metallic wire of cross sectional area $4 \times 10^{-6}\, m ^{2}$. If the density of the aluminum conductor is $2.7\, gm / cc$ considering aluminum gives $1$ electrons per atom for conduction find the drift speed of the electrons is ......... $\times 10^{-4} \,m / s$ if molecular weight of aluminum is $27 \,gm$.View Solution
- 5A wire is connected to a battery between the point $M$ and $N$ as shown in the figure $(1)$. The same wire is bent in the form of a square and then connected to the battery between the points $M$ and $N$ as shown in the figure $(2)$. Which of the following quantities increases?View Solution
- 6The total power dissipated (in $watt$ ) in the circuit shown isView Solution
- 7In a meter bridge experiment the balance point in obtained if the gaps are closed by $2\,\Omega$ and $3\,\Omega$. A shunt of $x\,\Omega$ is added to $3\,\Omega$ resistor to shift the balancing point by $22.5\,cm$. The value of $X$ is $................$View Solution
- 8The emf of a battery is $2\, V$ and its internal resistance is $0.5 \,\Omega$. The maximum power which it can deliver to any external circuit will be ............. $watt$View Solution
- 9A potentiometer consists of a wire of length $4\, m$ and resistance $10\,\Omega $. It is connected to a cell of $e.m.f.$ $2\, V$. The potential difference per unit length of the wire will be ............. $V/m$View Solution
- 10In the adjoining circuit diagram each resistance is of $10$ $\Omega$. The current in the arm $AD$ will beView Solution
