What is the value of resistance of ideal ammeter and ideal voltmeter? Why are an ammeter and a voltmeter respectively connected in series and parallel in a circuit?
What is the value of resistance of ideal ammeter and ideal voltmeter? Why are an ammeter and a voltmeter respectively connected in series and parallel in a circuit?
Show Hint
Solution and Explanation
Ideal Ammeter: An ideal ammeter has zero resistance. It is connected in series with the circuit, as the current to be measured flows through the ammeter without affecting the circuit.
Ideal Voltmeter: An ideal voltmeter has infinite resistance. It is connected in parallel with the component across which the potential difference is to be measured. This ensures that no current is drawn by the voltmeter, and only the potential difference is measured.
Top Questions on Magnetic Effects of Current and Magnetism
- A 1 cm segment of a wire lying along the x-axis carries a current of 0.5 A along the \( +x \)-direction. A magnetic field \( \mathbf{B} = (0.4 \, \text{mT}) \hat{j + (0.6 \, \text{mT}) \hat{k} \) is switched on in the region. The force acting on the segment is:}
- CBSE CLASS XII - 2025
- Physics
- Magnetic Effects of Current and Magnetism
- Derive the formula for the torque acting on a current-carrying loop in a uniform magnetic field and define the magnetic dipole moment with the help of it.
- UP Board XII - 2024
- Physics
- Magnetic Effects of Current and Magnetism
What are the Bohr's Postulates for the hydrogen atom? Write down the following for electrons in the ground state of hydrogen atom:
(i) Binding energy
(ii) Angular momentum
(iii) Total energy- UP Board XII - 2024
- Physics
- Magnetic Effects of Current and Magnetism
- When does the force acting between two parallel and straight current carrying conductors become (i) attractive and (ii) repulsive and why?
- UP Board XII - 2024
- Physics
- Magnetic Effects of Current and Magnetism
- Define 1 henry of self-inductance.
- UP Board XII - 2024
- Physics
- Magnetic Effects of Current and Magnetism
Questions Asked in UP Board XII exam
- The focal lengths of a convergent and a divergent lens are \( f_1 \) and \( f_2 \) respectively. If the lenses are placed in contact, then in the following conditions of combination, write the nature of the combined lens and also draw the ray diagram: (i) \( f_1>f_2 \)
(ii) \( f_1<f_2 \)
(iii) \( f_1 = f_2 \)
(i) Condition: \( f_1>f_2 \)- UP Board XII - 2024
- Optical Properties
Compare the Astronomical Telescope and Compound Microscope on the basis of the following:
(i) Components
(ii)Magnifying power
Explain with reason whether any one of the above devices can be used as the other device.
(i) Components- UP Board XII - 2024
- Optical Properties
- Represent the variation of binding energy per nucleon with mass number. On the basis of it, explain the following: (i) Nuclear fission
(ii) Nuclear fusion
(iii) Nuclear energy- UP Board XII - 2024
- Nuclear fission
- The energy of a hydrogen atom in an energy state is \( -3.4 \) electron-volts. For an electron in this energy state, calculate the following: (i) Binding energy
(ii) Ionization potential
(iii) The number of energy states
(iv) The angular momentum
(v) Kinetic energy
(i) Binding Energy- UP Board XII - 2024
- Atomic Structure
- On what factors does the magnetic flux linked with a coil depend? Explain the induced electromotive force on the basis of the following:
(i) Cause
(ii) Magnitude
(iii) Direction- UP Board XII - 2024
- Electromagnetic Theory and Electronics