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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 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)
Consider a system described by ẋ = Ax + Bu y = Cx + Du The system is completely output controllable if and only if Where: x = State vector (n-vector) u = Control vector (r-vector) y = Output vector (m-vector) A = n × n matrix B = n × r matrix C = m × n matrix D = m × r matrix
Consider the following statements about velocity potential : 1. Velocity potential is a vector function similar to stream function. 2. It is a fully three dimensional function and not limited to two coordinates. 3. Velocity potential does not exist at stagnation points. 4. Velocity potential exists only if the flow is Irrotational. Which of these statements are correct?
"It is now expected that the variable production cost per unit and the selling price per unit will each increase by 10%, and fixed production cost will rise by 25%. What will be the new break even point?
Selling price - Rs 6 per unit
Variable production cost - Rs 1.20 per unit
Variable selling cost - Rs 0.40 per unit
Fixed production cost - Rs 4 per unit
Fixed selling cost - Rs 0.80 per unit
Budgeted production and sales for the year are 10,000 units."
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.
Which of the following statements are CORRECT? I. Change in magnetic field produces induced current. II. Flow of current in a conductor produces magnetic field. III. Magnetic field related to coil can be produced by motion between conductor and coil.
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: The magnetic field disappears when the current is turned off. B: A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil. C: An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.  D: Electromagnets usually consist of wire wound into a coil. 
A piece of paraffin is placed in a uniform magnetic field H0. The sample contains hydrogen nuclei of mass mp, which interact only with external magnetic field. An additional oscillating magnetic field is applied to observe resonance absorption. If g1 is the g-factor of the hydrogen nucleus, the frequency at which resonance absorption takes place, is given by