1
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

The electric and the magnetic field associated with an E.M. wave, propagating along the $$\mathrm{Z}$$-axis can be represented by

A
$$\left(\mathbf{E}=E_0 \hat{\mathbf{i}}, \mathbf{B}=B_0 \hat{\mathbf{j}}\right)$$
B
$$\left(\mathbf{E}=E_0 \hat{k}, \mathbf{B}=B_0 \hat{\mathbf{i}}\right)$$
C
$$\left(\mathbf{E}=E_0 \hat{\mathbf{j}}, \mathbf{B}=B_0 \hat{\mathbf{i}}\right)$$
D
$$\left(\mathrm{E}=E_0 \hat{\mathrm{j}}, \mathrm{B}=B_0 \hat{\mathrm{k}}\right)$$
2
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

An electron of mass $$m$$ and charge $$e$$ initially at rest gets accelerated by a constant field $$2 E$$. The rate of change of de-Broglie wavelength of this electron at time $$t$$ ignoring relativistic effects is

A
$$-\frac{h}{\left(2 e E t^2\right)}$$
B
$$\frac{-e h t}{2 E}$$
C
$$\left(\frac{-2 m h}{e E t^2}\right)$$
D
$$\left(\frac{-h}{e E}\right)$$
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