Magnetic Effects Of Electric Current

In this quiz, you will be able to attempt the questions based on magnetism, magnetic effects of electric current, electromagnetism, induction, etc.

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For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is

The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid The strong magnetic field produced inside the solenoid can be used to magnetize a piece of magnetic material like soft iron, when placed inside the coil The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet The N- and S-poles exchange position when the direction of current through the solenoid is reversed

The strength of magnetic field inside a long current carrying straight solenoid is

More at the ends than at the center Minimum in the middle Same at all points Found to increase from one end to the other

To convert an AC generator into DC generator

Split-ring type commutator must be used Slip rings and brushes must be used A stronger magnetic field has to be used A rectangular wire loop has to be used

The most important safety method used for protecting home appliances from short circuiting or overloading is

Earthing Use of fuse Use of stabilizers Use of electric meter

Choose the incorrect statements from the following regarding magnetic lines of field.

the direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points magnetic field lines are closed curves if magnetic field lines are parallel and equidistant, they represent zero field strength relative strength of magnetic field is shown by the degree of closeness of the field lines.

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in the figure. The direction of magnetic field at a point will be North to South

Directly above the wire

Directly below the wire

At a point located in the plane of the paper, on the north side of the wire

At a point located in the plane of the paper, on the south side of the wire.

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is:

Towards south

Towards east

Downward

Upward

The device used for producing electric current is called

Generator

Galvanometer

Ammeter

Motor

Magnetic lines of force inside current carrying solenoid are

Perpendicular to axis.

Along the axis and are parallel to each other.

Parallel inside the solenoid and circular at the ends.

Circular.

If the current values periodically from zero to a maximum value, back to zero, and then reverses its direction, the current is

Direct

Alternative

Pulsating

None of the above

The condition for the phenomenon of electromagnetic induction is that there must be a relative motion between

The galvanometer and magnet

The coil of wire and galvanometer

The coil of wire and magnet

The magnet and galvanometer

We can induce the current in a coil by

Moving the coil in a magnetic field

By changing the magnetic field around it

By changing the orientation of the coil in the magnetic field

All of above

A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference