MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100

Draw a neat diagram of a tangent galvanometer. Explain how it may be used to measure a current. Why it is most accurate when deflection is near to 45°.

Important Questions on Electromagnetism

MEDIUM
12th West Bengal Board
IMPORTANT
A narrow beam of charged particles of different species and speeds is passed through a small hole at one end of a tube with crossed uniform electric and magnetic fields, both normal to the initial direction of the velocities. Explain which particles of what charge, mass and speed would come out of the small hole at the other end of the tube.
EASY
12th West Bengal Board
IMPORTANT
You are given a low resistance R1, a high resistance R2 and a moving coil galvanometer. Explain how you use these to measure current.
 
EASY
12th West Bengal Board
IMPORTANT
You are given a low resistance R1, a high resistance R2 and a moving coil galvanometer. Explain how you use these to measure potential difference.
EASY
12th West Bengal Board
IMPORTANT
What is meant by radial magnetic field? Explain why such a field is necessary for a moving coil galvanometer. How it is produced in the galvanometer?
EASY
12th West Bengal Board
IMPORTANT
A circular coil of radius 10 cm has 250 turns. Find the magnetic field at its centre if the coil carries a current of 20 mA.
 
EASY
12th West Bengal Board
IMPORTANT
A circular coil of radius 10 cm has 250 turns. Find the magnetic field at a point 20 cm away from its centre on the axis of the coil, if the coil carries a current of 20 mA.
EASY
12th West Bengal Board
IMPORTANT
Two long parallel straight wires X and Y Separated by a distance 5 cm in air carrying currents of 10 A and 5 A respectively in opposite direction. Calculate the magnitude and direction of the force on 20 cm length of the wire Y.
HARD
12th West Bengal Board
IMPORTANT
A straight wire of length π2 metre, is bent into a circular shape. If the wire was to carry a current of 5 A, Calculate the magnetic field, due to it, before bending, at a point distance 0.01 times the radius of the circle formed from it. Also calculate the magnetic field at centre of the circular loop formed, for the same value of the current.