Q1PhysicsUnit 13: Magnetic Effects of Current and Magnetism
A fiat circular coil, carrying a current,
has a magnetic moment
This question has multiple correct options
Physics · JEE
Important Questions: Current loop as a magnetic dipole and its magnetic dipole moment, bar magnet as an equivalent solenoid, magnetic field lines for JEE
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Syllabus context
Part of Magnetic Effects of Current and Magnetism in JEE Main Physics.
- Biot Savart law and its application to the current carrying circular loop
- Ampere's law and its applications to infinitely long current carrying straight wire and solenoid
- Force on a moving charge in uniform magnetic and electric fields
- Force on a current-carrying conductor in a uniform magnetic field
- The force between two parallel currents carrying conductors-definition of ampere
- Torque experienced by a current loop in a uniform magnetic field: Moving coil galvanometer, its sensitivity and conversion to ammeter and voltmeter
- Current loop as a magnetic dipole and its magnetic dipole moment, bar magnet as an equivalent solenoid, magnetic field lines
- Magnetic field due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis, torque on a magnetic dipole in a uniform magnetic field
- Para-, dia- and ferromagnetic substances with examples, the effect of temperature on magnetic properties
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Q2PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Assertion
An electric bell is a mechanical bell that
functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing or clanging sound. Electric bells have been widely used at railroad crossings, in telephones, fire and burglar alarms, as school bells,
doorbells, and alarms in industrial
plants.
Reason
Electromagnetic force is the force of
attraction between the north and south
poles of magnets
Q3PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Current is flowing in a coil of area
number of turns then magnetic
moment of the coil is is equal to
Q4PhysicsUnit 13: Magnetic Effects of Current and Magnetism
A bar magnet is dropped along the axis of copper ring held horizontally. The acceleration of fall is
Q5PhysicsUnit 13: Magnetic Effects of Current and Magnetism
Magnetic field lines:
Q6PhysicsUnit 13: Magnetic Effects of Current and Magnetism
The drawn at any point on the magnetic lines of force gives direction of magnetic field at that point.
Q7PhysicsUnit 13: Magnetic Effects of Current and Magnetism
An electromagnet:
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