1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2024 Physics - Rotational Motion Question 2 English

A small ball of mass m is suspended from the ceiling of a floor by a string of length $$\mathrm{L}$$. The ball moves along a horizontal circle with constant angular velocity $$\omega$$, as shown in the figure. The torque about the centre (O) of the horizontal circle is

A
$$\mathrm{mgL} \sin \theta$$
B
$$\mathrm{mg} \mathrm{L}$$
C
$$0$$
D
$$\mathrm{mg} \mathrm{L} \cos \theta$$
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
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If $$\hat{n}_1, \hat{n}_2$$ and $$\hat{\mathrm{t}}$$ represent, unit vectors along the incident ray, reflected ray and normal to the surface respectively, then

WB JEE 2024 Physics - Geometrical Optics Question 2 English

A
$$\hat{n_2}=\hat{n_1}-2\left(\hat{n_1} \cdot \hat{t}\right) \hat{t}$$
B
$$\hat{n}_2=\hat{n_1}+2\left(\hat{n_1} \cdot \hat{\mathrm{t}}\right) \hat{\mathrm{t}}$$
C
$$\hat{\mathrm{n}_2}=-\hat{\mathrm{n}_1}$$
D
$$\hat{n_2}=2 \hat{n_1}-\left(\hat{n_1} \times \hat{\mathrm{t}}\right) \cdot \hat{n_1}$$
3
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A beam of light of wavelength $$\lambda$$ falls on a metal having work function $$\phi$$ placed in a magnetic field B. The most energetic electrons, perpendicular to the field are bent in circular arcs of radius R. If the experiment is performed for different values of $$\lambda$$, then $$\mathrm{B}^2$$ vs. $$\frac{1}{\lambda}$$ graph will look like (keeping all other quantities constant)

A
WB JEE 2024 Physics - Dual Nature of Radiation Question 1 English Option 1
B
WB JEE 2024 Physics - Dual Nature of Radiation Question 1 English Option 2
C
WB JEE 2024 Physics - Dual Nature of Radiation Question 1 English Option 3
D
WB JEE 2024 Physics - Dual Nature of Radiation Question 1 English Option 4
4
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A charged particle moving with a velocity $$\vec{v}=v_1 \hat{i}+v_2 \hat{j}$$ in a magnetic field $$\vec{B}$$ experiences a force $$\vec{F}=F_1 \hat{i}+F_2 \hat{j}$$. Here $$v_1, v_2, F_1, F_2$$ all are constants. Then $$\overrightarrow{\mathrm{B}}$$ can be

A
$$\vec{B}=B_1 \hat{i}+B_2 \hat{j}$$ with $$\frac{v_1}{v_2}=\frac{B_1}{B_2}$$
B
$$\vec{B}=B_1 \hat{i}+B_2 \hat{j}+B_3 \hat{k}$$ with $$\frac{v_1}{v_2}=\frac{B_1}{B_2}$$
C
$$\overrightarrow{\mathrm{B}}=\mathrm{B}_3 \hat{\mathrm{j}}$$ with $$\mathrm{B}_1=\mathrm{B}_2=0$$
D
$$\vec{B}=B_1 \hat{j}+B_2 \hat{k}$$ with $$\frac{B_1}{B_2}=\frac{v_1}{v_2}$$
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