Electromagnetic Induction

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1. CSCA Physics December 2025 Past Paper
   The international units for magnetic flux density $B$ and magnetic flux are respectively ( ).
   • A．Tesla, Weber
   • B．Ampere, Volt
   • C．Pascal, Hertz
   • D．Joule, Watt
   정답 및 풀이 보기

   정답: A

   1 Magnetic flux density B has unit Tesla (T). Magnetic flux $\Phi$ has unit Weber (Wb).
   CSCA Physics December 2025 Past Paper 전체에서 보기
2. CSCA Physics April 2026 Past Paper
   In a 50 -turn coil, the magnetic flux changes uniformly from 0.2 Wb to 0.6 Wb in 0.1 s . The induced EMF is
   • A．200 V
   • B．20 V
   • C．100 V
   • D．50 V
   정답 및 풀이 보기

   정답: A

   $\varepsilon = N \frac { \Delta \Phi } { \Delta t } = 50 \times \frac { 0.6 - 0.2 } { 0.1 } = 50 \times 4 = 200 \mathrm {~V}$.
   CSCA Physics April 2026 Past Paper 전체 풀기 — 시간 측정 및 채점
3. CSCA Physics March 2026 Past Paper
   Parallel rails connected by R; wire ab slides frictionlessly in a perpendicular uniform field. When ab moves right at constant speed, which is correct?
   • A．Constant speed continues after removing force
   • B．ab experiences both pulling force and Ampère force
   • C．Increasing R increases pulling force
   • D．Greater speed means smaller pulling force
   정답 및 풀이 보기

   정답: B

   Moving wire generates $\epsilon$, current, and Ampère force opposing motion. Constant speed requires a pull to balance the Ampere force (B). A: removing force → deceleration. C: larger R → less current → less Ampère force → less pull needed. D: faster → larger $\epsilon \rightarrow$ more current → more Ampère force → more pull needed. Answer: B.
   CSCA Physics March 2026 Past Paper 전체 풀기 — 시간 측정 및 채점