NEET Physics Questions: Electromagnetic Induction

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing withtime. The induced current in the inner loop then, is




According to Lenz's law, the direction of the induced current is such that it opposes the change in magnetic flux that caused it. Since the current in the outer loop is increasing clockwise, the magnetic field due to this current is increasing out of the plane. To oppose this increase, the induced current in the inner loop must create a magnetic field into the plane. Hence, the induced current in the inner loop must be counterclockwise.
A magnetic field $2 \times 10^{-2} T $ acts at right angles to a coil of area $200 cm^2$ with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t is




No explanation available.
A coil has an area of $0.05 m^2$ & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , $4 \times 10^{–5} Wb/m^{-2}$. It is rotated through $ 90 ^\circ $ in 0.1 sec. The average emf induced in the coil is...




No explanation available.
A coil having n turns & resistance $ R \Omega $ is connected with a galvanometer of resistance $ 4 R \Omega $ . This combination is moved from a magnetic field $W_1 Wb$ to $W_2$ Wb in t second. The induced current in the circuit is....




No explanation available.
When a train travels with a speed $360 km h^{-1} $ along the track separated by 1 meter. The vertical component of earth's magnetic field is $ 0.1 \times 10^{-4} T $ . What is the value of induced emf between the rails ?




No explanation available.
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A circular loop of radius R carrying current I lies in X-Y plane with its centre at origin. The total magnetic flux through x-y plane is.....




The total magnetic flux through the plane of the circular loop is zero because the magnetic field lines produced by the current in the loop are symmetric with respect to the plane of the loop. Since the loop lies in the X-Y plane, the net magnetic flux through this plane is zero.
Two similar circular loops carry equal currents in the same direction.On moving the coils further apart, the electric current will




Oppose any change
When the number of turns in a coil is make four time without anychange in length of the coil, its self inductance becomes......




The self-inductance of a coil is directly proportional to the square of the number of turns. If the number of turns is made four times without any change in the length of the coil, the self-inductance becomes 4^2 = 16 times. Therefore, the self-inductance becomes sixteen times.

A metal rod moves at a constant velocity in a direction perpendicular to its length & a constant uniform magnetic field too. Select the correct statement (s) from the following.





When a metal rod moves in a direction perpendicular to its length and a uniform magnetic field, an electromotive force (emf) is induced in the rod. This creates an electric field within the rod. Hence, there is an electric field in the rod.
Two co-axial solenoids are made by a pipe of cross sectional area $10 cm^2$ and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance is........




No explanation available.
The self inductance of a straight conductor is…




The self-inductance of a straight conductor is zero because self-inductance depends on the flux linkage with the coil formed by the conductor. A straight conductor does not form a coil, and hence, there is no flux linkage, resulting in zero self-inductance.
Two coils of self inductances 2 mH & 8 mH are placed so close togather that the effective flux in one coil is completely half with the other.The mutual inductance between these coils is.......




$ L = k \sqrt { L_0 L_2 } , k = 1/2 $
In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance becomes




$ L \alpha N^2 $
The armature of dc motor has $ 20 \Omega $ resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will be




The back EMF (Electromotive Force) in a DC motor can be calculated using Ohm's Law and the formula for the back EMF. The voltage drop across the armature resistance is given by $V_R = I imes R$, where $I$ is the current and $R$ is the resistance. Given that the armature resistance is 20 Ξ© and the current is 1.5 A, the voltage drop is $V_R = 1.5 imes 20 = 30V$. The back EMF $E_b$ can be found by subtracting this voltage drop from the supply voltage: $E_b = V_{supply} - V_R = 220V - 30V = 190V$.
Two identical circular loops of metal wire are lying on a table near to each other without touching. Loop A carries a current which increasing with time. In response the loop B.......




When a current in loop A is increasing, it creates an increasing magnetic field. According to Lenz's Law, loop B will experience an induced current that opposes the change in magnetic flux. This induced current in loop B will create its own magnetic field, which will oppose the magnetic field of loop A. Therefore, loop B is repelled by loop A.