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De Broglie wavelength of an electron moving perpendicular to a magnetic field

The same question, asked 2 times: 20 Apr 2026 S2*, 12 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    20 Apr 2026 S2

    131
    An electron is moving with initial velocity v⃗=V0j^\vec{v} = V_0\hat{j} in a magnetic field B⃗=B0i^\vec{B} = B_0\hat{i}. Its de-Broglie wavelength will

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  2. Question 2

    12 May 2026 S1

    131
    An electron is moving with initial velocity v⃗=ak^\vec{v} = a\hat{k} in a magnetic field B⃗=bj^\vec{B} = b\hat{j}. Its de-Broglie wavelength will

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