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Inductance is defined as the ratio of:
Inductance is the ratio of the flux-linkage to current. It is equal to $N\Phi/I$.
If a changing current in coil 2 induces an emf in a nearby coil 1, this phenomenon is called:
A changing current in a coil (coil 2) can induce an emf in a nearby coil (coil 1). This phenomenon is called mutual induction.
The self-induced emf in a coil is given by $\epsilon = -L \frac{dI}{dt}$. The quantity 'L' is known as:
When a current in a coil changes, it induces a back emf in the same coil. The self-induced emf is given by $\epsilon = -L \frac{dI}{dt}$. L is the self-inductance of the coil. It is a measure of the inertia of the coil against the change of current through it.
What is the SI unit of magnetic flux?
The SI unit of magnetic flux is weber (Wb) or tesla meter squared (T m$^2$).
Which of the following best describes the principle of an AC generator?
In an ac generator, mechanical energy is converted to electrical energy by virtue of electromagnetic induction.
The magnetic flux ($\Phi_B$) through a surface of area A placed in a uniform magnetic field B is mathematically expressed as:
The magnetic flux through a surface of area A placed in a uniform magnetic field B is defined as, $\Phi_B = B \cdot A = BA \cos \theta$ where $\theta$ is the angle between B and A.
What happens to the induced current in a coil when the speed of a magnet moving towards it is increased?
Further, the deflection (and hence current) is found to be larger when the magnet is pushed towards or pulled away from the coil faster. This is because a faster motion leads to a greater rate of change of magnetic flux, leading to a larger induced emf and thus a larger current.
The current in coil C2 connected to a battery is constant. What happens to the magnetic flux through a nearby coil C1, and what is the induced emf in C1?
When the key is held pressed, current in coil C2 is constant. Therefore, there is no change in the magnetic flux through coil C1 and the current in C1 will be zero (and consequently no induced emf).
The energy required to build up a current $I$ in an inductor with self-inductance $L$ is stored as magnetic potential energy. This energy can be expressed as:
The total amount of work done in establishing the current I (and thus the magnetic energy stored) is $W = \frac{1}{2}LI^2$.
In a stationary conductor, when an emf is induced due to a time-varying magnetic field, the force on its charges arises from:
In the case of a stationary conductor, the force on its charges is given by $F = q(E + v \times B)$. Since $v = 0$, any force on the charge must arise from the electric field term E alone. Therefore, to explain the existence of induced emf or induced current, we must assume that a time-varying magnetic field generates an electric field.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.