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JEE Main Effects of Electric Current — practice questions — page 2

Explore 37 free Effects of Electric Current questions in JEE Main Science. Open each question or exercise to read its content, reference answers and available explanation.

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Effects of Electric Current questions and exercises with answers

Showing questions 31–37 of 37.

Ohm's law is valid under the condition that theRead the answer and worked solution →The quantity $R = \dfrac{V}{I}$ for a conductor is called itsRead the answer and worked solution →For a conductor obeying Ohm's law, which equation correctly relates potential difference $V$, current $I$, and resistance $R$?Read the answer and worked solution →What is the electric field at the centre of a hollow conducting sphere of radius $R$ carrying total charge $Q$?Read the answer and worked solution →Ohm's law states that, for an ohmic conductor at constant temperature:Read the answer and worked solution →Three identical resistors, each of resistance $R$, are connected in **parallel**. The equivalent resistance is:Read the answer and worked solution →A circular coil of radius $R$ carries current $I$. The magnetic field at the centre of the coil is:Read the answer and worked solution →

Worked practice questions

Ohm's law is valid under the condition that the

  1. conductor length keeps changing
  2. temperature of the conductor remains constant
  3. current is always zero
  4. battery has infinite emf
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Correct answer: B. temperature of the conductor remains constant

The statement of Ohm's law includes the condition of constant temperature. If temperature changes, the resistance may change and the proportionality between $V$ and $I$ may no longer hold.

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The quantity $R = \dfrac{V}{I}$ for a conductor is called its

  1. resistivity
  2. conductance
  3. resistance
  4. current density
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Correct answer: C. resistance

From Ohm's law, $R = V/I$ is constant for a given conductor at constant temperature and is called its resistance.

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For a conductor obeying Ohm's law, which equation correctly relates potential difference $V$, current $I$, and resistance $R$?

  1. $V = I/R$
  2. $V = R/I$
  3. $V = IR$
  4. $V = I^2R$
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Correct answer: C. $V = IR$

The mathematical form of Ohm's law is $V = IR$. Rearranging it also gives $R = V/I$.

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