Physics · JEE

Important Questions: Ampere's law and its applications to infinitely long current carrying straight wire and solenoid for JEE

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The most important Ampere's law and its applications to infinitely long current carrying straight wire and solenoid questions for JEE cover conceptual traps, standard results, and numerical patterns from Ampere's law and its applications to infinitely long current carrying straight wire and solenoid. Goodmarks provides 7+ high-yield MCQs with full solutions.

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Syllabus context

Part of Magnetic Effects of Current and Magnetism in JEE Main Physics.

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Q1PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The direction of magnetic lines of forces close to a straight conductor carrying current will be -

Q2PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A long coil containing a large number of close turns of insulated copper wire.

Q3PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A long solenoid has magnetic field strength of

3.14 \times 10^{-2} \mathrm{T}

inside it when a current of

5 A

passes through it The number of turns in 1 m of the solenoid is

Q4PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A straight wire lying in a horizontal plane carries a current from north to south. What will be the direction of magnetic field at a point just underneath it?

Q5PhysicsUnit 13: Magnetic Effects of Current and Magnetism

Assertion If the current in a solenoid is reversed in direction while keeping the same magnitude, the magnetic field energy stored in the solenoid decreases. Reason Magnetic field energy density is proportional to square of current

Q6PhysicsUnit 13: Magnetic Effects of Current and Magnetism

A solenoid is

1.5 m

long and its inner diameter is

4.0 \mathrm{cm}

. It has 3 layers of winding's of 1000 turns each and carries a current of 2.0 amperes.The magnetic flux for a cross-section of the solenoid is nearly.

Q7PhysicsUnit 13: Magnetic Effects of Current and Magnetism

The magnetic field generated along the axis of a solenoid is proportional to:

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Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

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Key areas include Ampere's law and its applications to infinitely long current carrying straight wire and solenoid. Prioritise these before moving to edge cases.

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