Question
The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0ms when connected to an AC source. The frequency of the source:
- 20Hz.
- 50Hz.
- 200Hz.
- 500Hz.
✓
Answer
- 50Hz.
Frequency of the source is remain constant = 50Hz.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A long magnetic needle of length $2L,$ magnetic moment $M$ and pole strength $m$ units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be
→The coefficient of mutual inductance of the two coils is $5H$. The current through the primary coil is reduced to zero value from $3A$ in $1$ millisecond. The induced emf in the secondary coils is.
→Two point charges $q_1$ and $q_2$ are situated at a distance d. There is no such point in between them where the electric field is zero. What can we deduce?
→The resistances of a wire at temperatures $t^{\circ} C$ and $0^{\circ} C$ are related by
→Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be(a) 2.12 Å(b) 4.77 Å(c) 1.06 Å (d) 1.59 Å
When a metal plate is introduced between the two plates of a charged capacitor and insulated from them, then which of following statement(s) is/ are correct?
- The metal plate divides the capacitor into two capacitors connected in parallel to each other.
- The metal plate divides the capacitors into two capacitors connected in series with each other.
- The metal plate is equivalent to a dielectric of zero dielectric constant.
A watch glass containing some powdered substance is placed between the pole pieces of a magnet. Deep concavity is observed at the centre. The substance in the watch glass is:
The lead wires should have(a) Larger diameter and low resistance(b) Smaller diameter and high resistance(c) Smaller diameter and low resistance(d) Larger diameter and high resistance
Zener diode is used for:
The resultant capacitance between $A$ and $B$ in the following figure is equal to
→