NEET Physics Electromagnetic Induction Class 12 Questions

The flux linked with a circuit is given by ϕB = t² + 2. The graph between time (X⁻axis) and induced emf (Y⁻axis) will be a

Two coils are placed near each other. When the current in one coil is changed at the rate of 5 A/s, an emf of 2 mV is induced in the other. The mutual inductance of the two coils is

A metallic rod of length 'L' is rotated with an angular speed of 'ω' normal to a uniform magnetic field 'B' about an axis passing through one end of rod as shown in figure. The induced emf will be:

Dimensional formula of mutual inductance is

A transformer is used to light 140 W, 24 V lamp from 240 V ac mains. If the main current is 0.7 Å, the efficiency of the transformer is

Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.

Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio. In the light of the above statement,

choose the correct answer from the options given below:

The induced emf can be produced in a coil by

A wire of irregular shape turning into a circular shape in a magnetic field which is directed into the paper. The direction of induced current is then

The mutual inductance of two coils, in a given orientation is 50 mH. If the current in one of the coils changes as i = 1.0sin(100πt + π/3) A, the peak value of emf (in volt) induced in the other coil will be

When the current changes from +2 Å to –2 Å in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is

A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the earth's magnetic field at the place. If the magnitude of the magnetic field is 0.4 G, what is the induced emf between the axle and the rim of the wheel?

The current (I) in the inductance is varying with time according to the plot shown in figure. Which one of the following is the correct variation of voltage with time in the coil?

A conducting circular loop is placed in a uniform magnetic field of 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is

What is the relationship between the magnetic energy per unit volume and the magnetic field strength?

What can happen to sensitive electrical instruments in the vicinity of an electromagnet when it is turned on or off?

What is the self-induced emf also referred to as?

What is the phenomenon called when emf is induced in a single coil due to the change of flux through that coil?

What is the formula for calculating the induced emf when a rod moves at right angles to a magnetic field?

What happens to the induced emf when a straight conductor moves at right angles to a uniform magnetic field?

What does Lenz's law state about the polarity of induced emf?

What causes the electric current to be induced in coil C1 when coil C2 is moved relative to it?

What is the relationship between the induced emf in a circuit and the magnetic flux through the circuit?

What does Lenz's law state about the direction of the induced emf?

What is the induced emf generated across a conductor moving with speed v in a magnetic field B known as?

What is the formula used to calculate the maximum voltage generated in a rotating coil within a magnetic field?

According to Faraday's laws, the induced emf in a circuit is proportional to which of the following?

What is the SI unit of self-inductance?

What is the mutual inductance of solenoid S2 with respect to solenoid S1 denoted as?

What factor does the mutual inductance of a pair of coils depend on?

What is the relationship between the induced emf and the rate of change of magnetic flux through a circuit?

What causes the separation of charges in a rod moving through a magnetic field?

What is the SI unit of mutual inductance?

What causes the separation of charges in a rotating rod in a magnetic field?

What is the constant of proportionality in the relationship between magnetic flux linkage through a coil and the current through that coil in self-induction?

What does Lenz's Law state about the direction of induced current?

What does Lenz's law state about the direction of induced current in a closed loop?

What does Lenz's law state about the direction of induced current in a closed loop?

What is the maximum voltage generated in a coil with 100 turns, an area of 0.1 m², rotating at half a revolution per second in a uniform magnetic field of 0.01 T?

What does Lenz's law state about the direction of induced current?

Which of the following statements about motional EMF is correct?

Which of the following statements about self and mutual induction are correct?

What is the SI unit of magnetic flux?

According to Faraday's laws, what is the induced emf in a circuit equal to?

Which of the following statements about self and mutual induction is correct?

Which of the following statements about motional EMF is correct?

Which of the following statements about electromagnetic induction is correct?

Which of the following statements about electromagnetic induction is correct?

Which of the following statements about Faraday's Laws of electromagnetic induction is correct?

Which of the following statements about Lenz's Law is correct?

Which of the following statements about Lenz's Law is correct?