StudentAidUnit 10: Electromagnetism — Mcqs
11th Class Physics · Unit 10: Electromagnetism
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Multiple Choice Questions
1.A current is flowing towards north along a power line. The direction of the magnetic field over the wire is directed towards:
2.The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to:
3.The diagram shows a beam of electrons entering a magnetic field. What is the effect of magnetic field on the electrons?
- a They are deflected into the plane of the diagram.
- b They are deflected out of the plane of the diagram.
- c They are deflected towards the bottom of the diagram.
- d They are deflected towards the top of the diagram.
4.The force exerted on a wire of 1 metre length carrying 1 ampere current placed aright angle to the magnetic field is called:
5.The unit of flux density is:
6.A moving charged particle is surrounded by:
7.Magnetic force on the charge q moving parallel to magnetic field with velocity v is:
8.The unit NA^-1m^-1 is called:
9.Electrons while moving perpendicularly through a uniform magnetic field are:
10.A magnet is suspended from a spring. The magnet oscillates and moves in and out of the coil connected to a galvanometer. When the magnet oscillates, the galvanometer shows:
SLO Based Additional MCQs + Past papers MCQs of Punjab Boards
Magnetic field
1.One of the following quantities that is not affected by the magnetic field is:
- a Moving charge
- b Change in magnetic flux
- c Current flowing in conductor
- d Stationary charge
2.Magnetic field is detected by:
3.A changing magnetic field produces:
- a Electric current
- b Changing Electric field
- c Magnetic field
- d Conservative field
Force on current carrying conductor in a magnetic field
4.What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m² when the force acting on the wire is 5N?
Magnetic compass
5.A magnetic compass will be deflected if it is kept near a:
Current passing through a wire
6.If a current is passing through a wire, the magnet lines of force are:
Direction of magnetic line of forces
7.The direction of lines of magnetic force can be found by:
Lines of force
8.If electric current flows from top towards the bottom through a wire then the direction of lines of force would be:
Force on current carrying conductor placed in a magnetic field
9.Force on a current carrying conductor placed in a magnetic field is given by the relation:
Force acting on current carrying conductor placed in a magnetic field
10.A current carrying straight conductor is placed in a magnetic field parallel to it. The force experienced by the conductor is:
Force on two parallel straight wires carrying current in opposite direction
11.Two free parallel straight wires carrying currents in the opposite direction:
12.Two free parallel straight wires carrying currents in the same direction:
Magnetic force on current carrying conductor
13.If the current passing through a wire in a magnetic field is doubled, the magnetic force would become:
Magnetic flux
14.The number of magnetic lines of force passing through any surface is known as:
15.Magnetic flux will be maximum when:
Flux density
16.A 0.50T field over an area of 2m² which lies at angle of 60° to the field, then the magnetic flux is:
17.Total number of magnetic lines of force passing normally through unit area is called:
Unit of magnetic flux
18.The SI unit of magnetic flux is:
Unit of magnetic induction
19.The SI unit of magnetic induction or flux density is:
20.The S.I. unit of magnetic induction is:
Trajectory of a charged particle in magnetic field
21.When a charged particle is projected perpendicular to uniform magnetic field, its trajectory (path) is:
Work done by magnetic field
22.The work done by a magnetic field for revolving the charged particle q in a circular path will be:
Units of force E and B
23.The unit of E is NC^-1 and B is NA^-1m^-1 the unit of E/B is:
e.m.f. (Electro motive force)
24.The fact that emf produced by motion of a coil across a magnetic field was discovered by:
Motional e.m.f.
25.The e.m.f. produced in the conductor when it moves across a magnetic field is called:
Induced e.m.f.
26.What is induced when there is a relative motion between coil and the magnet?
27.The value of the induced emf is directly proportional to the rate of change of:
Induced current
28.The current produced when the conductor moves across a magnetic field is called:
Electrostatic induction
29.The phenomenon by which an induced emf is produced due to change of flux is called:
Motional e.m.f.
30.The motional emf depends upon the:
31.If velocity of conductor moving in a magnetic field is zero then its motional emf will be:
Lenz's law
32.The direction of induced current is always so as to oppose the change, which causes the current. This is the statement of:
33.Lenz's law is consistent with:
34.Lenz's law deals with the:
- a Magnitude of induced current
- b Magnitude of induced emf
- c Direction of induced emf
- d Direction of induced current
Induced e.m.f. in a coil
35.Production of induced emf in a coil is linked with: