If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be

In DC machines the residual magnetism is present. The order of residual magnetism is ___________

A

2 to 3 per cent

B

10 to 15 per cent

C

20 to 25 per cent

D

50 to 75 per cent

In the circuit given below, what is the current flowing in 6Ω resistances?
Electricity and Magnetism mcq question image

A

0.22

B

0.55 A

C

2.22 A

D

2.775 A

The symbol represents.
Electricity and Magnetism mcq question image

A

unconnected wire crossing

B

a voltmeter

C

variable resistance or current controller

D

a resistance of resistance R

Use of signal in an electrical circuit. It is indicated by . . . . . . . .?

A

Rheostat

B

Resistor

C

Wire joint

D

Electric cell

What do the given symbol in figure represents in a reference of electric circuit?
Electricity and Magnetism mcq question image

A

resistance

B

plug key

C

electric bulb

D

battery

The given symbol stands for a/an . . . . . . . . in an electric circuit.
Electricity and Magnetism mcq question image

A

plug key

B

electric bulb

C

battery

D

resistor

The flow of . . . . . . . . is anti-clockwise in the given circuit.
Electricity and Magnetism mcq question image

A

resistance

B

voltage

C

electrons

D

current

What does the diagram shows?
Electricity and Magnetism mcq question image

A

Random motion of electrons in closed circuit

B

Random motion of protons in open circuit

C

Random motion of atoms in open circuit

D

Random motion of electrons in open circuit

In a circuit diagram, Electricity and Magnetism mcq question image

The given symbol is used as follows:

A

A wire joint

B

A battery B

C

An electric bulb

D

A resistor of resistance R

Consider the following image.
Electricity and Magnetism mcq question image

A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be

A

to the right

B

to the left

C

out of the page

D

into the page

If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be

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