1
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
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An interference pattern is obtained with two coherent sources of intensity ratio n : 1. The ratio $$\mathrm{{{{I_{\max }} - {I_{\min }}} \over {{I_{\max }} + {I_{\min }}}}}$$ will be maximum if

A
n = 1
B
n = 2
C
n = 3
D
n = 4
2
WB JEE 2023
MCQ (More than One Correct Answer)
+1
-0.25
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WB JEE 2023 Physics - Electromagnetic Induction Question 4 English

A circular coil is placed near a current carrying conductor, both lying on the plane of the paper. The current is flowing through the conductor in such a way that the induced current in the loop is clockwise as shown in the figure. The current in the wire is,

A
time dependent and downward.
B
steady and upward.
C
time dependent and upward.
D
An alternating current.
3
WB JEE 2023
MCQ (Single Correct Answer)
+2
-0.5
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An amount of charge Q passes through a coil of resistance R. If the current in the coil decreases to zero at a uniform rate during time T, then the amount of heat generated in the coil will be,

A
$$\frac{4 Q^{2} \mathrm{R}}{3 \mathrm{~T}}$$
B
$$\frac{2 \mathrm{QR}}{3 \mathrm{~T}}$$
C
$$\frac{\mathrm{Q}^{2} \mathrm{~T}}{4 \mathrm{R}}$$
D
$$\mathrm{Q}^{2} \mathrm{RT}$$
4
WB JEE 2023
MCQ (Single Correct Answer)
+2
-0.5
Change Language

A modified gravitational potential is given by $$\mathrm{V}=-\frac{\mathrm{GM}}{\mathrm{r}}+\frac{\mathrm{A}}{\mathrm{r}^{2}}$$. If the constant A is expressed in terms of gravitational constant (G), mass (M) and velocity of light (c), then from dimensional analysis, A is,

A
$$\frac{G^{2} M^{2}}{c^{2}}$$
B
$$\frac{\mathrm{GM}}{\mathrm{c}^{2}}$$
C
$$\frac{1}{c^{2}}$$
D
Dimensionless
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