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Electromagnetic Waves question

2022 · 26 Jul · Shift 2 · Q55
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  5. /2022 · 26 Jul · Shift 2 · Q55

Electromagnetic Waves question

2022 · 26 Jul · Shift 2 · Q55

JEE MainPhysicsElectromagnetic WavesMCQ+4 / −1
A velocity selector consists of electric field E⃗=E k^\vec{E}=E \,\hat{k}E=Ek^ and magnetic field B⃗=B j^\vec{B}=B \,\hat{j}B=Bj^​ with B=12 mTB=12 \,m TB=12mT. The value of EEE required for an electron of energy 728 eV728 \,\mathrm{e} V728eV moving along the positive xxx-axis to pass undeflected is : (Given, mass of electron =9.1×10−31 kg=9.1 \times 10^{-31} \mathrm{~kg}=9.1×10−31 kg )
  1. A
    192 kVm−1192 \,\mathrm{kVm}^{-1}192kVm−1
  2. B
    192 mVm−1192 \,\mathrm{mVm}^{-1}192mVm−1
  3. C
    9600 kVm−19600 \,\mathrm{kVm}^{-1}9600kVm−1
  4. D
    16 kVm−116 \,\mathrm{kVm}^{-1}16kVm−1
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