MEDIUM
12th West Bengal Board
IMPORTANT
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Magnetic field at the centre of a coil in the form of a square of side 4 cm carrying current of 5 A is -

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Important Questions on Electromagnetism

EASY
12th West Bengal Board
IMPORTANT
A toroid has a core of outer radius 26 cm and inner radius 25 cm around which 4000 turns of conducting wire are wound. If current in the wire is 10 A, magnetic field inside the core of the toroid is-
EASY
12th West Bengal Board
IMPORTANT

A and B are two concentric coils of centre O and carry currents I1 and I2 are shown in Fig.8.133. If the ratio of their radii 1:2 and the ratio of the flux densities at O due to A and B is 1:3, then value of I1I2 is-

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MEDIUM
12th West Bengal Board
IMPORTANT
An electron is travelling along X-direction. It encounters a magnetic field in Y-direction. Its subsequent motion will be-
HARD
12th West Bengal Board
IMPORTANT
Two particles X and Y having equal charges, after being accelerated through the same potential difference enter a region of uniform magnetic field and describes circular paths of radii r1 and r2 respectively. The ratio of the mass of X and Y is 
MEDIUM
12th West Bengal Board
IMPORTANT
A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E. and B represent the electric and magnetic fields respectively, this region of space may have 
MEDIUM
12th West Bengal Board
IMPORTANT
A particle of charge -16×10-18C moving with velocity 10 ms-1 along the X-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 104V/m is along the negative Z-axis. If the charged particle continues moving along the X-axis, the magnitude of B is-
EASY
12th West Bengal Board
IMPORTANT
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointed in the same direction-
MEDIUM
12th West Bengal Board
IMPORTANT
A proton of mass 1.67×10-27 kg and charge 1.6×10-19 C is projected with a speed of 2×106 m s-1 at an angle of 60° to the X-axis. If a uniform magnetic field of 0.104 Tesla is applied along Y-axis, the path of proton is-