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

A straight wire carries conventional current toward the sky.

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

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

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

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

In alternating current:

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

The magnetic field around a current carrying coil

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

The magnetic field around a current-carrying coil lasts

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 _________.

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

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:

Household appliances are usually not connected in series because:

What is a commutator?

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

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 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:

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?