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4616

The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called 

  • A. ferrite substance
  • B. paramagnetic substance
  • C. ferromagnetic substance
  • D. diamagnetic substance
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4617

A body of mass, M, moving with velocity, V, has a wavelength, X, associated with it. This phenomenon is called----------

  • A. photoelectric effect
  • B. heisenberg's uncertainty principle
  • C. compton effect
  • D. wave-particles paradox
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4618

Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences ---------------

  • A. maximum motor force if the current reverses its direction
  • B. no motor force of it is parallel to the field
  • C. no motor force if it is perpendicular to the field
  • D. a motor force with constant direction if either the current or the magnetic field is reversed
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Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
4619

Three cells each of emf, 1.0 V, and internal resistance, 2 \(\Omega\), are connected in parallel across a 3\(\Omega\)  resistor. Determine the current in the resistor.

  • A. 0.90A
  • B. 0.39A
  • C. 0.30A
  • D. 0.01A
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4620

Which of the following statements about electric potential energy is not correct?

  • A. The electric potential energy of a positively charged particle increases when it moves to a point of higher potential
  • B. The electric potential energy of a negatively charged particle increases when it moves to a point of lower potential
  • C. The electric potential energy of a positively charged particle decreases when it moves to a point of higher potential
  • D. The work done in taking a charged particle around a closed path in an electric field is zero.
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