Electromagnetism Test. 3

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1) A conductor of length 1 m moves at right angles to a magnetic field of 1 T with a velocity of 2 m/s. The induced EMF is:

2 V

4 V

0.5 V

1 V

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2) The direction of the magnetic force on a positive charge is determined by the:

Right-hand palm rule

Left-hand rule

Ampere's rule

Right-hand grip rule

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3) An ideal solenoid has 1000 turns per meter and carries a current of 2 A. What is the magnetic field inside it? (Use µ₀ = 4π x 10⁻⁷ T·m/A)

4π x 10⁻³ T

2π x 10⁻⁴ T

4π x 10⁻⁴ T

8π x 10⁻⁴ T

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4) The presence of a magnetic field can be detected by a:

Stationary charge

Resistor

Glass rod

Magnetic compass

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5) A 10 cm wire carrying a current of 5 A is placed in a magnetic field of 0.2 T. If the wire is perpendicular to the field, the force on the wire is:

0.01 N

1 N

10 N

0.1 N

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6) If a current-carrying solenoid is suspended freely, it will align itself in which direction?

It will not align in any specific direction

North-South

East-West

Vertically

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7) A 20 cm long wire carries a current of 10 A and is placed in a 0.4 T magnetic field. If the wire makes an angle of 30° with the field, what is the magnetic force on the wire?

0.8 N

0.2 N

1.6 N

0.4 N

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8) In a region where the magnetic field is zero, a moving charge will experience:

No force

A force parallel to its velocity

A variable force

A maximum force

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9) A proton (mass = 1.67 x 10⁻²⁷ kg, charge = 1.6 x 10⁻¹⁹ C) moves at 2 x 10⁶ m/s and enters a 0.1 T magnetic field at a right angle. What is the radius of its circular path?

10 cm

21 cm

5.0 cm

42 cm

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10) The magnetic field at the center of a circular current loop is:

Directly proportional to the radius

Inversely proportional to the radius

Inversely proportional to the current

Zero

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11) The mutual inductance between two coils depends on their:

Resistance and capacitance

Temperature and pressure

Current and voltage

Geometry and orientation

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12) Ampere's Law is used to calculate:

Induced EMF

Electric flux

Resistance

Magnetic field in symmetric situations

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13) In a transformer, the primary coil has 100 turns and the secondary has 200 turns. If the input voltage is 120 V AC, the output voltage will be:

60 V

240 V

120 V

480 V

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14) For a DC motor, the current drawn is maximum when the motor has:

Reached maximum speed

Just started

A heavy mechanical load

No mechanical load

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15) An electron and a proton enter a magnetic field with the same velocity, perpendicular to the field. They will be deflected:

With the same radius

In opposite directions

In the same direction

They will not be deflected

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16) Magnetic lines of force:

Can intersect each other

Start from a north pole and end on a south pole

Are always parallel

Form continuous closed loops

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17) The purpose of the split-ring commutator in a DC generator is to:

Reverse connection to the external circuit every half rotation

Reverse current in the external circuit every half rotation

Increase the induced EMF

Reduce friction

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18) The sensitivity of a galvanometer is increased by decreasing the:

Magnetic field strength (B)

Area of the coil (A)

Torsional constant (c) of the suspension wire

Number of turns (N)

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19) An ideal step-down transformer decreases:

Voltage

Current

Power

Frequency

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20) The strength of the magnetic field is indicated by the:

Direction of the field lines

Spacing of the field lines

Length of the field lines

Color of the field lines

Your score is

The average score is 30%

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Moazzam

October 12, 2025 at 2:36 am

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Electromagnetism Test. 3

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