1. Which instrument should, ideally, have zero resistance?
   

CVoltmeter

AWheatstone bridge

DAmmeter

BOscilloscope

1. A long conductor shown in the figure carries a current I in the direction indicated by the arrow. Which statement is not correct about the magnetic field produced by this current carrying conductor?
   

AReversing the current direction will reverse the direction of the magnetic field

BDoubling the current through the conductor doubles the field strength

CThe field strength is directly proportional to the distance from the conductor

DThe magnetic field encircles the conductor

1. Which of the following is not true about magnetic field?
   

Amagnetic field lines are closed

Bmagnetic monopoles exist

CThe closer the field lines are, the stronger the magnetic field

Dmagnetic field is produced by moving charges

1. A square flat loop of wire is placed in a uniform magnetic field that is in the y direction. The magnetic flux through the loop is a maximum if the plane of the loop is in the
   

Axy plane

Bxz plane

Cyz plane

Dinclined 45° with respect to the xy plane

1. Lentz's law in electromagnetic induction follows from which law of conservation?
   

Aenergy

Bcharge

Cmomentum

Dmass

1. Which conversion process forms the basis for the function of an electric generator
   

Aalternating current to direct

Celectrical energy to mechanical

Bmechanical energy to electrical

Dlow voltage to high voltage or vice versa

1. A step-up transformer is used to
   

AIncrease the power

CIncrease the voltage

BDecrease the power

DDecrease the voltage

1. Which device uses the principle of electromagnetic induction for its operation?
   

AAC generator

BMoving coil meter

CCathode ray tube

DLight emitting diode

1. Which of the following statements is not true?
   

AAn electric current can be induced in a circuit with a change in cross-sectional area of the wire

BThe induced emf in the circuit is directly proportional to the time rate of change of magnetic flux

Cemf can be induced in a circuit by change in the area enclosed by the loop

DAn electric current can be induced in a circuit with a changing of magnetic field

1. Which device function with the principle of mutual inductance
   

AElectromagnet

BTransformer

CElectric motor

DTransistor