Question
Can the potential difference across a battery be greater than its emf?
✓
Answer
In general potential difference can be equal or less than the emf.
E.m.f can never exceed the potential difference.
If the emf of a battery is E Volt, the potential difference across a battery is given by,
V = E - I r where I is the current in the circuit and r is the internal resistance.
E.m.f can never exceed the potential difference.
If the emf of a battery is E Volt, the potential difference across a battery is given by,
V = E - I r where I is the current in the circuit and r is the internal resistance.
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
Two metal strips, each of length l, are clamped parallel to each other on a horizontal floor with a separation b between them. A wire of mass m lies on them perpendicularly, as shown in A vertically-upward magnetic field of strength B exists in the space. The metal strips are smooth but the coefficient of friction between the wire and the floor is $\mu.$ A current i is established when the switch S is closed at the instant t = 0. Discuss the motion of the wire after the switch is closed. How far away from the strips will the wire reach?
→The susceptibility of magnesium at 300K is 1.2 × 10-5. At what temperature will the susceptibility increase to 1.8 × 10-5?
When an electron falls from a higher energy to a lower energy level, the difference in the energies appears in the form of electromagnetic radiation. Why cannot it be emitted as other forms of energy?
A ball is projected from a point on the floor with a speed of 15m/s at an angle of 60° with the horizontal. Will it hit a vertical wall 5m away from the point of projection and perpendicular to the plane of projection without hitting the floor? Will the answer differ if the wall is 22m away?
Obtain the expression of electric field at any point by continuous distribution of charge on a volume.
Write the uses of Gauss's law.
Find the area bounded by the curve y = e-x, the X-axis and the Y-axis.
What is the importance of binding energy per nucleon ?
In Exercises 7.3 and 7.4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.
Prove that $\varepsilon_0 \mu_0=\frac{1}{c^2}\left(\right.$ or $\left.c=\frac{1}{\sqrt{\varepsilon_0 \mu_0}}\right)$. ###
Derive the relation between the permittivity of free space $\left(\varepsilon_0\right)$, the permeability of free space $\left(\mu_0\right)$ and the speed of light $(c)$.
→Derive the relation between the permittivity of free space $\left(\varepsilon_0\right)$, the permeability of free space $\left(\mu_0\right)$ and the speed of light $(c)$.