LMS

A charged particle is moving along X-axis in a magnetic field along the Y-axis. The direction of magnetic force acting on it is 

Electron and proton having masses me and mp respectively enter the region of a uniform, perpendicular magnetic field with same velocity. The ratio of the radii of their circular paths inside the field is 

A magnetic field exerts a force on a charged particle

Magnetic effect of current was discovered by 

A step up transformer has transformation ratio of 3:2. What is the voltage in secondary if the primary voltage is 30 V?

An electron and a proton travel with equal speed and in the same direction, at 90° to a uniform magnetic field. They experience forces, which are initially

One proton beam enters a magnetic field of 10^-4T normally, Specific charge = 10¹¹C/kg. velocity = 10⁷m/s. What is the radius of the circle described by it

A transformer has 100 turns in primary coil and 200 turns in the secondary coil. If 200 V emf is induced in the secondary coil then the input emf is 

A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. the time taken by the particle to complete one revolution is

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then. 

An electric current is flowing in a long straight wire. The magnetic field due to this current at a distance of 5 cm from the wire is 10 gauss. The magnetic field at a distance of 10 cm from the wire is 

The unit of magnetic flux is equal to; 

Which of the following does not affect the motion of moving Electron? 

In case of a straight conductor, the magnetic lines of force are

One 0.1 Wbm^-2is equal to

A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be 

The total number of magnetic lines of force passing through a certain area perpendicular to a magnetic field is called

In a step up transformer, primary coil has 10 turns while secondary has 100 turns. A battery of emf 4.5V is connected to the primary of transformer. The voltages across secondary will be 

An a-particle enters the magnetic field as shown in figure then the charge particle will move 

A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointed in the same direction.

Which of the following have smallest e/m ratio 

Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called

Why picture on a TV screen became distorted when a magnet is brought near screen?

An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if

The direction of induced current in a loop can be determine by

A uniform magnetic field will cause a charge to move in a circle if the charge is moving 

A magnetic field

An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true?                                                         

Lorentz force is given by

In a laboratory experiment of test a transformer, a student used the circuit shown in the diagram to take measurements.

Two of the original entries in the student’s result table are missing as shown:

Assuming the transformer was 100% efficient, what are the missing results?

Four particles move at the same speed in the direction perpendicular to the same magnetic field which particle is deflected the most?   

When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius   

A charged particle moving in a magnetic field experiences a force given by:   

A strong magnetic field is applied on a stationary electron. Then the electron  

The north pole of a long horizontal bar magnet is being brought close to a vertical conducting plane along the perpendicular direction. The direction of induced current in the conducting plane will be

Magnetic flux and magnetic flux density are related as

 A particle of mass m and charge Q moving with velocity V enters the region of a uniform magnetic field at right angle to the direction of its motion. How does its kinetic energy get affected?

An electron is moving in circle of radius r in a uniform magnetic field B. Suddenly the field is reduced to B/2 The radius of the circle now becomes

Soft iron core in a transformer is used to reduce 

An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then                   

Transformer is based on the principle of

In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be  

A magnetic compass will be deflected if it is kept near a

The figure shows the motion of electrons in a wire that is near the N pole of a magnet. The wire will be pushed

The ratio of emf across primary coil to the emf across secondary coil is 

An electron is injected into a uniform magnetic field with components of velocity parallel to and normal to the field direction. The path of the electron is a 

A transformer steps down 200 volts to 22 volts to operate a device with a impedance of 220 ohm, then the current drawn from the mains by the primary of the transformer is

What is increased in step-down transformer?   

One Wbm^-2 is equal to

The branch of physics which deals with the magnetic effect of electric current is known as