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Which of the following statements is/are incorrect about the Prismatic Compass? A. The needle is broad but it does not act as an index. B. The graduated ring is attached with the needle. This does not rotate along with the line of sight. C. The readings are taken directly seeing through the top of the glass.
Consider the following statement: a) Magnetic field lines are always form closed curve. b) Magnetic field lines start from north pole outside the magnet c) Magnetic field lines start from south pole outside the magnet Which of the following is a property of magnetic field lines?
A magnetized needle of the magnetic moment 20 JT-1 is placed at 60o with the direction of the uniform magnetic field of magnitude 9 T. What is the torque acting on the needle?
Fabric part needle of a sewing machine includes
1. Set point needle
2. Ball point needle
Select the correct answer
A current carrying coil having magnetic moment M is placed in a magnetic field B. Initially the magnetic field is perpendicular to the plane of the coil and then coil turned about an axis such that the angle between the magnetic field and the plane of the coil become zero. Then choose the correct statement.
A force \(\vec F\), acting on a electric charge q, in presence of electro-magnetic field, moves the charge parallel to the magnetic field with velocity \(\vec v\). Then \(\vec F\) is equal to (where \(\vec E\)and \(\vec B\) are electric field and magnetic field respectively)
If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
Statement I A compass needle placed near a current-carrying wire will get deflected.
Statement II A current-carrying wire creates magnetic field around it.
In which direction does a magnetic compass needle always point?
Which of the following is the reason for an iron core increasing the magnetic field of a coil of wire? 1. The iron atoms line up to add the magnetic field. 2. Iron is, among other things, attracted to a magnetic field. Choose the correct code.