List of top Science Questions on Magnetic Effects of Current and Magnetism

The pattern of magnetic field due to a current carrying wire depends upon the shape made by that wire. Justify.
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally towards the front wall from the back wall, is deflected by a strong magnetic field to your right side. Find the direction of the magnetic field.
Describe an activity to show that a current carrying conductor, placed in an external magnetic field experiences a force.
A current carrying straight wire AB is shown in the given diagram. Out of X, Y and Z on which point will the strength of magnetic field be maximum and why?
When will the magnitude of the force be highest?
By using the given experimental set-up, how can it be shown that:
A force is exerted on the current-carrying conductor AB when it is placed in a magnetic field.
The direction of the force can be reversed in two ways.
What do you understand by electromagnetic induction ?
What is dynamo ? What is its use ?
When electric current flows through a conducting wire, what type of magnetic field is generated above and below the wire ?
If a compass is placed near a wire carrying electric current, the compass needle
Name and state the rule for determining the direction of force on a current carrying conductor placed in a magnetic field.
A straight conductor is suspended horizontally with its axis perpendicular to the magnetic field of a strong horseshoe magnet. The conductor gets displaced towards the right when a steady current is passed through it. What will happen to the displacement of the conductor if:
  1. Polarity of the horseshoe magnet is reversed?
  2. Direction of current in the conductor is reversed?
  3. Current through the conductor is increased?
Write the shape of the magnetic field produced by a current carrying straight conductor. State the rule to find the direction of this field.
two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
Assertion (A): The intensity of the magnetic field produced at the centre of a current-carrying circular coil increases on increasing the number of turns in the coil.
Reason (R): The current that flows in each turn of the coil has the same magnitude and same direction, and the magnetic field, due to each turn, just adds up.
Name the device used to magnetise a piece of magnetic material. Draw a labelled diagram to show the arrangement used for the magnetisation of a cylinder made of soft iron.
Draw a labelled diagram to show the pattern of magnetic field lines produced due to a current carrying straight conductor. Mark on it the direction of current in the conductor and the direction of magnetic field lines.
The current carrying device which produces a magnetic field similar to that of a bar magnet is:
uniform magnetic field
A uniform magnetic field exists in the plane of paper as shown in the diagram. In this field, an electron (e−) and a positron (p+) enter as shown. The electron and positron experience forces :
Draw a diagram to show the pattern of magnetic field lines on a horizontal sheet of paper due to a straight conductor passing through its centre and carrying current vertically upwards. Mark on it (i) the direction of current in the conductor and (ii) the corresponding magnetic field lines. State right hand thumb rule and check whether the directions marked by you are in accordance with this rule or not.
Assertion (A): The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased.
Reason (R): Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.
Strength of magnetic field produced by a current carrying solenoid DOES NOT depend upon:
Name and state the rule to determine the direction of a:
(i) magnetic field produced around a current carrying straight conductor.
(ii) force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.
(i) Two magnetic field lines do not intersect each other. Why?
(ii) How is a uniform magnetic field in a given region represented?
Draw a diagram in support of your answer.
The pattern of the magnetic field produced inside a current carrying solenoid is :