Moving Charges and Magnetism

JEE Main 2024 (Online) 27th January Morning ShiftNumericalEasy📈 Topic in 17% papers+4

Ques. 1JEE Main 2024, 27 January (Morning Shift)

Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is 5.0 cm. The magnitude of the magnetic field at a point P midway between the wires is (Given : 0 = 4 10-7 T m A-1) [figure]

Answer

160

Solution

[figure]

Opposite currents ⇒ both fields at P are into the page ( ) ⇒ they add

B = 2 0 I2 d, d = 2.5 cm

= 4 10-7 10 2.5 10-2

= 1.6 10-4 T = 160

Answer: 160

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Ques. 2JEE Main 2024, 27 January (Evening Shift)

A current of 200 deflects the coil of a moving coil galvanometer through 60 . The current to cause deflection through 10 radian is :

Ques. 3JEE Main 2024, 27 January (Evening Shift)

The magnetic field at the centre of a wire loop formed by two semicircular wires of radii R1=2 m and R2=4 m, carrying current I=4 A as per figure given below is 10-7 T. The value of is . (Centre O is common for all segments) [figure]

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