1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The electric potential for an electric field directed parallel to X-axis is shown in the figure. Choose the correct plot of electric field strength.

WB JEE 2022 Physics - Electrostatics Question 11 English

A
WB JEE 2022 Physics - Electrostatics Question 11 English Option 1
B
WB JEE 2022 Physics - Electrostatics Question 11 English Option 2
C
WB JEE 2022 Physics - Electrostatics Question 11 English Option 3
D
WB JEE 2022 Physics - Electrostatics Question 11 English Option 4
2
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

An electron revolves around the nucleus in a circular path with angular momentum $$\overrightarrow L $$. A uniform magnetic field $$\overrightarrow B $$ is applied perpendicular to the plane of its orbit. If the electron experiences a torque $$\overrightarrow T $$, then

A
$$\overrightarrow T ||\overrightarrow L $$
B
$$\overrightarrow T $$ is anti-parallel to $$\overrightarrow L $$
C
$$\overrightarrow T \,.\,\overrightarrow L = 0$$
D
Angle between $$\overrightarrow T $$ and $$\overrightarrow L $$ is $$45^\circ $$
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A straight wire is placed in a magnetic field that varies with distance x from origin as $$\overrightarrow B = {B_0}\left( {2 - {x \over a}} \right)\widehat k$$. Ends of wire are at (a, 0) and (2a, 0) and it carries a current I. If force on wire is $$\overrightarrow F = I{B_0}\left( {{{ka} \over 2}} \right)\widehat j$$, then value of k is

A
1
B
5
C
$$-$$1
D
$${1 \over 2}$$
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

In a closed circuit there is only a coil of inductance L and resistance 100 $$\Omega$$. The coil is situated in a uniform magnetic field. All on a sudden, the magnetic flux linked with the circuit changes by 5 Weber. What amount of charge will flow in the circuit as a result?

A
500 C
B
0.05 C
C
20 C
D
Value of L is to be known to find the charge flown
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