ASTER PUBLIC SCHOOL GREATER NOIDA
CLASS - X
SUBJECT - PHYSICS
CH : MAGNETIC EFFECTS OF CURRENT
1 Draw magnetic field lines around a bar magnet. Name the device which is used to draw magnetic
field lines.
2 Design an activity to demonstrate that a bar magnet has a magnetic field around it
3 What are magnetic field lines? Justify the following statements:
(a) Two magnetic field lines never intersect each other.
(b) Magnetic field are closed curves.
4. (a) What is meant by a magnetic field? Mention two parameters that are necessary to describe it
completely.
(b) If field lines of a magnetic field are crossed at a point, what does it indicate?
5 State how the magnetic field produced by a straight current carrying conductor at a point depends
on
(a) current through the conductor
(b) distance of point from conductor
6 Find the direction of magnetic field due to a current carrying circular coil held:
(i) vertically in North – South plane and an observer looking it from east sees the current to flow
in anticlockwise direction,
(ii) vertically in East – West plane and an observer looking it from south sees the current to flow
in anticlockwise direction,
(iii) horizontally and an observer looking at it from below sees current to flow in clockwise
directio
7 (a) State three factors on which the strength of magnetic field produced by a current carrying
solenoid depends.
(b) Draw circuit diagram of a solenoid to prepare an electromagnet.
8 (a) State Right Hand Thumb rule to find the direction of the magnetic field around a current
carrying straight conductor.
(b) How will the magnetic field be affected on:
(i) increasing the current through the conductor
(ii) reversing the direction of flow of current in the conductor?
9. (a) What is an electromagnet? List any two uses.
(b) Draw a labelled diagram to show how an electromagnet is made.
(c) State the purpose of soft iron core used in making an electromagnet.
(d) List two ways of increasing the strength of an electromagnet if the material of the
electromagnet is fixed.
10 What is solenoid? Draw the pattern of magnetic field lines of
(i) a current carrying solenoid and
(ii) a bar magnet.
List two distinguishing features between the two fields.
11 Draw the magnetic field lines through and around a single loop of wire carrying electric current.
12 (i) List the factors on which the magnitude of force experienced by conductor depends.
(ii) When is the magnitude of this force maximum?
(iii) State the rule which helps, in finding the direction of motion of conductor.
(iv) If initially this force was acting from right to left, how will the direction of force change if:
(a) direction of magnetic field is reversed?
(b) direction of current is reversed?
13 State whether an alpha particle will experience any force in a magnetic field if (alpha particles are
positively charged particles)
(i) it is placed in the field at rest.
(ii) it moves in the magnetic field parallel to field lines.
(iii) it moves in the magnetic field perpendicular to field lines.
Justify your answer in each case.
14 Describe an activity with labelled diagram to show that a force acts on current carrying conductor
placed in a magnetic field and its direction of current through conductor. Name the rule which
determines the direction of this force.
15 Write one application of Fleming’s right hand rule.
16 Give reasons for the following:
(a) It is dangerous to touch the live wire of the main supply rather than neutral wire.
(b) In household circuit, parallel combination of resistances is used.
(c) Using fuse in a household electric circuit is important.
17 a) Fuse acts like a watchman in an electric circuit. Justify this statement.
(b) Mention the usual current rating of the fuse wire in the line to (i) lights and fans (ii) appliance
of 2 kW or more power.
18 (a) Name two safety measures commonly used in an electric circuit and appliances.
(b) What precaution should be taken to avoid the overloading of domestic electric circuits?
19 (a) Draw a schematic diagram of a common domestic circuit showing provision of
(i) Earth wire, (ii) Main fuse
(iii) Electricity meter and
(iv) Distribution box.
(b) Distinguish between short circuiting and overloading.
20 Mention and explain the function of an earth wire. Why it is necessary to earth metallic
appliances?
