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Punjab (PTB) · Chapter test · Free

1st Year Physics Chapter 10 TestElectromagnetism

30 marks · 40 minutes · 21 questions. Covers: CHAP 10: Electromagnetism.

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1st Year Physics Chapter 10 Test

1st Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. If fingers of right hand show the direction of magnetic field and palm shows the direction of force, then thumb points for:

    1. Torque

    2. Voltage

    3. Current

    4. Inducted

  2. Which force balance the magnetic attraction to prevent ferrofluids from settling?

    1. Buoyant force

    2. Brownian motion

    3. Electrostatic repulsion

    4. Gravitational pull

  3. A current flowing towards the reader be denoted by:

    1. Cross

    2. A bracket

    3. A dot

    4. Positive sign

  4. Lenz's law is related to the:

    1. Conservation of momentum

    2. Conservation of mass

    3. Conservation of charge

    4. Conservation of energy

  5. A current is flowing towards north along a power line. The direction of the magnetic field over the wire is directed towards:

    1. North

    2. South

    3. East

    4. West

  6. Which property allows ferrofluids to respond to magnetic fields?

    1. Thermal conductivity

    2. Paramagnetism

    3. Ferromagnetism

    4. Superconductivity

  7. Fleming left hand rule is used to determine the direction of:

    1. Magnetic field

    2. Induced current

    3. Force on a current-carrying conductor

    4. Electric field

  8. The current flowing through a coil due to induced emf in it depends upon:

    1. Shape of the coil

    2. Resistance of the coil

    3. Area of the coil

    4. Magnetic flux

  9. The unit of magnetic flux is:

    1. Tesla

    2. Weber

    3. Ampere

    4. None

  10. A 5m wire carrying a current of 2A is at right angles to the uniform magnetic field of 0.5 weber m-2 The force on the wire is:

    1. 2 N

    2. 4 N

    3. 5 N

    4. 1.5 N

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. Is it possible to change both the area of the loop and the magnetic field passing through the loop and still not have an induced emf in the loop? Give reason.

  2. How does Lenz' law obey the law of conservation of energy?

  3. At a given instant, a proton moves in the position x-direction in a region where there is magnetic field in the negative z-irection. What is the direction of the magnetiv force? Wil the proton continue to move in the positive z-direction? Explain.

  4. A plane conducting loop is located in a uniform magnetic field that is directed along x-axis. For what orientation of the loop is the flux a maximum? For orientation is the flux a minimum?

  5. A sensitive galvanometer cannot be table. Explain?

  6. Electric force does work. while no work done by the magnetic force. why?

  7. What factors affect the magnitude of induced emf?

  8. Does the induced emf always act to decrease the magnetic flux through a circuit?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Explain how ferrofluids work?

  2. Electrons are accelerated from rest through a potential difference of 15 kV in an oscilloscope. The electrons then pass through a 0.35 T magnetic field that deflects them to the desired position on the screen. Find the magnitude of the maximum force that an electron can experience.

  3. A proton is accelerated by a potential difference of 6 x 105 volts. It then enters perpendicularly in a uniform magnetic field B = 1.0 weber m-2 ,Find the radius of curvature of the path of the proton. m = 1.67x10-27kg, e = 1.6x10-19C.