The most important safety method used for protecting home appliances from short circuiting or overloading is:
- AEarthing.
- ✓Use of fuse.
- CUse of stabilizers.
- DUse of electric meter.
Answer: B.
View full solution →Question types
Magnetic Effects of Electric Current question types
32 questions across 5 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
32
Questions
5
Question groups
5
Question types
01
M.C.Q
12 Q→02[1 Mark Questions]
1 Q→03[2 Mark Questions]
3 Q→04[3 Mark Questions]
9 Q→05[5 marks Questions]
7 Q→Sample Questions
Magnetic Effects of Electric Current questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Choose the incorrect statement from the following regarding magnetic lines of field:
- AThe direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.
- BMagnetic field lines are closed curves.
- ✓If magnetic field lines are parallel and equidistant, they represent zero field strength.
- DRelative strength of magnetic field is shown by the degree of closeness of the field lines.
Answer: C.
View full solution →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:
- AThe 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.
- BThe strong magnetic field produced inside the solenoid can be used to magnetise 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.
- DThe N- and S-poles exchange position when the direction of current through the solenoid is reversed.
Answer: C.
View full solution →Choose the incorrect statement:
- AFleming’s right-hand rule is a simple rule to know the direction of induced current.
- BThe right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors.
- CThe difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically.
- ✓In India, the AC changes direction after every $\frac{1}{50}$ second.
Answer: D.
View full solution →To convert an AC generator into DC generator:
- ✓Split-ring type commutator must be used.
- BSlip rings and brushes must be used.
- CA stronger magnetic field has to be used.
- DA rectangular wire loop has to be used.
Answer: A.
View full solution →What is the role of the two conducting stationary brushes in a simple electric motor?
What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?
Name four appliances wherein an electric motor, a rotating device that converts electrical energy to mechanical energy, is used as an important component. In what respect motors are different from generators?
A magnetic compass shows a deflection when placed near a current carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason.
It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving (i) alpha particles, (ii) neutrons? Justify your answer.
Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation.
A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?
AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given $r_1 > r_2$, where will the strength of the magnetic field be larger?
View full solution →Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn?
Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?
Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.
Describe the working of an AC generator with the help of a labeled circuit diagram. What changes must be made in the arrangement to convert it to a DC generator?
With the help of a labelled circuit diagram illustrate the pattern of field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?
Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current carrying conductor?
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