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Hingga ujian berikutnya 14–15 November 2026:
Semua konsep

Electric Potential and Potential Difference

电势与电势差

The definition of potential and the choice of zero, how potential relates to field lines, computing potential difference, and the work done by the electrostatic force.

5 soal ujian asli · 4 kali ujian10 soal tryout10 soal latihan

Ujian CSCA dikerjakan dalam bahasa Mandarin atau Inggris — peserta memilih sendiri. Karena itu konsep dan rumus di sini disajikan dalam kedua bahasa tersebut; halaman ini menampilkan versi bahasa Inggris.

Rumus

  • Work done by the electrostatic force

    Rumus
    WAB=qUABW_{AB}=qU_{AB}

    Berlaku bila：Path-independent: it depends only on the potential difference between the endpoints

  • Definition of potential difference

    Definisi
    UAB=φA−φB=WABqU_{AB}=\varphi_A-\varphi_B=\frac{W_{AB}}{q}

    Berlaku bila：Potential difference is independent of the zero reference, although potential itself is not

Cara ujian sebenarnya menguji konsep ini

Soal dari ujian CSCA sebenarnya yang menguji konsep ini. Kerjakan sendiri dulu sebelum membuka jawabannya.

  1. CSCA Physics December 2025 Past Paper
    A point charge with a charge of +4×10−6C+ 4 \times 10 ^ { - 6 } \mathrm { C } is moved from point A to point B in an electric field. The electric force does negative work of 8×10−4 J8 \times 10 ^ { - 4 } \mathrm {~J}. The potential difference between points AA and BB is ( ).
    • A．- 200 V
    • B．200 V
    • C．- 2000 V
    • D．2000 V
    Lihat jawaban & pembahasan

    Jawaban: A

    1 Work done by electric force: W=q(VA−VB)W = q ( V A - V B ). 2 VA−VB=W/q=(−8×10−4)/(4×10−6)=−200 V\mathrm { VA } - \mathrm { VB } = \mathrm { W } / \mathrm { q } = \left( - 8 \times 10 ^ { - 4 } \right) / \left( 4 \times 10 ^ { - 6 } \right) = - 200 \mathrm {~V}.
    Lihat di CSCA Physics December 2025 Past Paper lengkap
  2. CSCA Physics March 2026 Past Paper
    In a uniform electric field, which statement is correct?
    • A．Potential is equal everywhere
    • B．Field strength is equal everywhere
    • C．Field lines are curved
    • D．Field direction varies everywhere
    Lihat jawaban & pembahasan

    Jawaban: B

    Uniform field: same magnitude and direction everywhere (B). Lines are parallel and equally spaced (C wrong). Direction is uniform (D wrong). Potential decreases along the field (A wrong). Answer: B.
    Kerjakan CSCA Physics March 2026 Past Paper lengkap — berwaktu & dinilai
  3. CSCA Physics April 2026 Past Paper
    A charge of +5×10−6C+ 5 \times 10 ^ { - 6 } \mathrm { C } moves from AA to BB. The electric force does +1×10−3 J+ 1 \times 10 ^ { - 3 } \mathrm {~J} of work. The potential difference UABU _ { A B } is
    • A．- 200 V
    • B．200 V
    • C．- 0.2 V
    • D．0.2 V
    Lihat jawaban & pembahasan

    Jawaban: B

    UAB=WABq=1×10−35×10−6=200 VU _ { A B } = \frac { W _ { A B } } { q } = \frac { 1 \times 10 ^ { - 3 } } { 5 \times 10 ^ { - 6 } } = 200 \mathrm {~V}. (Positive work on a positive charge implies UAB>0U _ { A B } > 0 : the charge moves from higher to lower potential.)
    Kerjakan CSCA Physics April 2026 Past Paper lengkap — berwaktu & dinilai

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Konsep terkait

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