1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
An electric current 'I' enters and leaves a uniform circular wire of radius r through diametrically opposite points. A particle carrying a charge q moves along the axis of the circular wire with speed v. What is the magnetic force experienced by the particle when it passes through the centre of the circle?
A
$$qv{{{\mu _0}i} \over a}$$
B
$$qv{{{\mu _0}i} \over {2a}}$$
C
$$qv{{{\mu _0}i} \over {2\pi a}}$$
D
Zero
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A current 'I' is flowing along an infinite, straight wire, in the positive Z-direction and the same current is flowing along a similar parallel wire 5 m apart, in the negative Z-direction. A point P is at a perpendicular distance 3m from the first wire and 4m from the second. What will be magnitude of the magnetic field B of P?
A
$${5 \over {12}}({\mu _0}I)$$
B
$${7 \over {24}}({\mu _0}I)$$
C
$${5 \over {24}}{{{\mu _0}I} \over \pi }$$
D
$${{25} \over {288}}({\mu _0}I)$$
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddenly halved, which of the following statements will be true?

WB JEE 2019 Physics - Magnetism Question 24 English
"The loop will .........".
A
stay stationary
B
move towards the wire
C
move away from the wire
D
move parallel to the wire
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
What is the current I shown in the given circuit?

WB JEE 2019 Physics - Current Electricity Question 27 English
A
$${V \over {2R}}$$
B
$${V \over {R}}$$
C
$${V \over {16R}}$$
D
$${V \over {8R}}$$
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