Definitions [3]
Define ampere.
Current passed through each of the two infinitely long parallel straight conductors kept at a distance of one meter apart in vacuum causes each conductor to experience a force of 2 × 10-7 newton per meter length of the conductor.
Define the term ‘current sensitivity’ of a moving coil galvanometer.
The current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it.
Mathematically, it can be given by:
IS = `(NBA)/k`
Where k is the couple per unit twist.
Current sensitivity is defined as the deflection e per unit current.
A device used to accelerate positively charged particles (α particles, deutrons, protons, etc.) to acquire enough energy to carry out nuclear disintegration is called a cyclotron.
Formulae [3]
mv = p = q BR
fa = fc
Final energy in cyclotron: proportional to \[\ R_{exit}^2\]
Key Points
- Electric field accelerates the particle; magnetic field keeps it in circular orbit of constant frequency.
- Resonance: polarity of Ds reverses as ion crosses gap after each semicircle.
- Cannot accelerate neutrons (uncharged) or electrons (small mass, high velocity).
- Ion speed is limited.
Important Questions [23]
- Obtain an Expression for Magnetic Induction Along the Axis of Toroid.
- Explain Ampere’S Circuital Law.
- State Ampere’S Circuital Law.
- State Ampere’s circuital law.
- Obtain the Expression for Current Sensitivity of Moving Coil Galvanometer.
- To convert a moving coil galvanometer into an ammeter we need to connect a ______.
- Calculate the Sensitivity of the Moving Coil Galvanometer
- A Circular Coil of 250 Turns and Diameter 18 Cm Carries a Current Of 12a. What is the Magnitude of Magnetic Moment Associated With the Coil?
- A Moving Coil Galvanometer Has a Resistance of 25ω and Gives a Full Scale Deflection for a Current of 10ma. How Will You Convert It into a Voltmeter Having Range 0 - 100 V?
- An Ideal Voltmeter Has ?
- A Galvanometer Has a Resistance of 16ω. It Shows Full Scale Deflection, When a Current of 20 Ma is Passed Through It. the Only Shunt Resistance Available is 0.06 Which is Not Ap
- The Combined Resistance of a Galvanometer of Resistance 500Ω and Its Shunt is 21Ω. Calculate the Value of Shunt
- Explain How Moving Coil Galvanometer is Converted into a Voltmeter. Derive the Necessary Formula.
- A Rectangular Coil of a Moving Coil Galvanometer Contains 100 Turns, Each Having Area 15 cm^2. It is Suspended in the Radial Magnetic Field 0.03 T.
- The Fraction of the Total Current Passing Through the Galvanometer is ............ .
- Show that the Current Flowing Through a Moving Coil Galvanometer is Directly Proportional to the Angle of Deflection of Coil.
- State how a moving coil galvanometer can be converted into an ammeter.
- If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.
- Which One of the Following Particles Cannot Be Accelerated by a Cyclotron?
- In a Cyclotron, Magnetic Field of 3·5wb/m^2 is Used To Accelerate Protons. What Should Be the Time Interval In Which the Electric Field Between the Dees Be Reversed?
- Draw a Neat Labelled Diagram for the Construction of 'Cyclotron'
- A Cyclotron is Used to Accelerate Protons to a Kinetic Energy of 5 Mev. If the Strength of Magnetic Field in the Cyclotron is 2t, Find the Radius and the Frequency Needed for the Applied Alternating
- Cyclotron is used to accelerate ______.
