List of top Science Questions on Magnetic Effects Of Electric Current

With the help of a labelled circuit diagram, illustrate the pattern of the magnetic field lines of the magnetic field produced around a straight current carrying conductor. Explain how, with the help of right-hand thumb rule, we can determine and mark the direction of magnetic field lines due to a current.
The shape of magnetic field lines produced (i) inside a solenoid (ii) around a straight conductor, both carrying current of the same magnitude are, respectively :
In which device does the split ring act as a commutator?
A split ring is used in:
A rectangular coil of copper wire is rotated in a magnetic field. The direction of the induced current in the coil changes after:
The SI unit of magnetic flux is:
Explain the production of a magnetic field due to current in a conductor by making a diagram.
The number of turns is increased by \( n \) times in a current-carrying circular coil. Then the magnetic field at the center of the coil is:
State the two ways to increase the force on a current-carrying conductor in a magnetic field. Name one device whose working depends on this effect. State Fleming’s left-hand rule with the help of a labelled diagram.
Electric motor is a device which transforms:
The most suitable material for making the core of an electromagnet is:
The magnetic field inside a long, straight current carrying solenoid:
What is the use of an electric motor? Discuss the construction, working principle and working of an electric motor with the help of a labelled diagram.
Mention any two properties of magnetic field lines. Define Maxwell's cork-screw rule for finding direction of magnetic field due to a straight current carrying wire. Depict the magnetic field lines due to a vertical current carrying conductor. Show uniform magnetic field in a given region.
What is the working principle of an electrical motor? Describe clearly its construction and working method with the help of a diagram.
What is the working principle of an alternating current generator? Describe its construction and working method with the help of a diagram.
One needs the help of which of the following rules to know the direction of the magnetic field produced due to a current carrying conductor?

The bulb in the circuit shown in Fig. does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

The bulb in the circuit

In the circuit shown in Fig.

Would any of the bulb glow when the switch is in the ‘OFF’ position?
(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Will the compass needle show deflection when the switch in the circuit shown by Fig. is closed?

Will the compass needle show deflection when the switch in the circuit