Practice Test – 2-Chapter13: Magnetic Effects Of Electric Current

A charge particle is moving in the direction of a magnetic field.The magnetic force acting on the particle:

Consider an experiment where Electric current is flowing in a wire. It is observed that clockwise magnetic field is produced around the wire. A teacher decides to reverse the direction of source battery which results in reversal of electrical current. What will be the effect on magnetic field?

The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is ................................

Current is flowing through a conductor and creates a magnetic field. Assume that this is the only source of the magnetic field. Reversing a current in a straight conductor with no change to the magnitude(ampere value) will cause a _________.

Which of the following electrical devices works on the principle of electro-magnetic induction ?

The magnetic field around a current carrying coil

Which one of the following statements best describes the nature of the field lines due to a bar magnet?

A length of wire carries a steady current. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

Household appliances are usually not connected in series because:

A beam of protons is moving horizontally towards you. As it approaches you, it passes through a magnetic field which is directed upwards. As you see it, the magnetic field will deflect the beam to the:

Why is the switch for any electrical appliance always fitted on to the live wire ?

As a negatively charged bowling ball rolls eastward toward some bowling pins, in what direction does it experience a force, due to the earth's magnetic field (Assume the earth's field is pointing straight north)?

A DC current flows through a vertical wire in the downward direction. For an observer looking at the wire, the direction of magnetic field at a point between him and the wire is:

In alternating current:

A soft bar is inserted inside a current carrying solenoid. The magnetic field inside the solenoid.

What is a commutator?

In a circular current-carrying conductor, if the current flows in the clockwise direction, the magnetic field direction is __________.

The magnetic field around a current-carrying coil lasts

A straight wire carries conventional current toward the sky.