HARD
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An electron move with velocity v in a uniform magnetic field B. The magnetic force experienced by the electron is
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Important Questions on Magnetic Effects of Electric Current
HARD
Nickel combines with a uninegative monodentate ligand to form a diamagnetic complex The hybridisation involved and the number of unpaired electrons present in the complex are respectively:
MEDIUM
An electron enters a chamber in which a uniform magnetic field is present as shown. Ignore gravity
During its motion inside the chamber
EASY
An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity , the magnetic field inside the superconductor will be such that
MEDIUM
A transformer consisting of turns in the primary and turns in the secondary gives output power of . If the current in the secondary coil is , then the input voltage and current in the primary coil are:
EASY
When the current in a coil changes from to in , an average voltage of is produced. The self-inductance of the coil is
MEDIUM
Two magnetic dipoles and are placed at a separation , with their axes perpendicular to each other. The dipole moment of is twice that of . A particle of charge is passing through their mid-point , at angle with the horizontal line, as shown in figure. What would be the magnitude of force on the particle at that instant? ( is much larger than the dimension of the dipole)
MEDIUM
Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure below) protruding through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate-
EASY
Earth Attracts particles because of _____:
HARD
If one were to apply the Bohr model to a particle of mass and charge moving in a plane under the influence of a magnetic field 'B', the energy of the charged particle in the level will be:
MEDIUM
An electron enters a chamber in which a uniform magnetic field is present as shown.
An electric field of appropriate magnitude is also applied so that the electron travels un-deviated without any change in its speed through the chamber. We are ignoring gravity. Then, the direction of the electric field is,
MEDIUM
A transformer having efficiency of is working on and power supply. If the current in the secondary coil is the voltage across the secondary coil and the current in the primary coil respectively are:
EASY
A power transmission line feeds input power at to a step down transformer with its primary windings having turns. The output power is delivered at by the transformer. If the current in the primary of the transformer is and its efficiency is , the output current would be:
MEDIUM
Consider a circular coil of wire carrying constant current forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by The magnetic flux through the area of the circular coil area is given by . Which of the following option is correct?
EASY
The shape of the path of free electron in a metal is _____:
MEDIUM
The electric fields of two plane electromagnetic plane waves in vacuum are given by and , at a particle of charge is at origin with a velocity ( is the speed of light in vaccum). The instantaneous force experienced by the particle is:
EASY
A charged particle carrying charge is moving with velocity . If an external magnetic field of exists in the region where the particle is moving then the force on the particle is . the vector is :
EASY
Voltsecond is the unit of:
MEDIUM
In a certain region static electric and magnetic fields exist. The magnetic field is given by . If a test charge moving with a velocity experiences no force in that region, then the electric field in the region, in SI units, is:
HARD
A circular loop of radius lies parallel to a much bigger circular loop of radius . The centre of the small loop is on the axis of the bigger loop. The distance between their centres is . If a current of flows through the smaller loop, then the flux linked with a bigger loop is:
EASY
The magnetic susceptibility is negative for:
