The total charge induced in a conducting loop when it is moved in magnetic field depends on
1) The rate of change of magnetic flux 2) Initial magnetic flux only 3) The total change in magnetic flux... View Article
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In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 Wb in 0.2 seconds. The charge that flows in the coil during this time is
1) 5.0 coulomb 2) 4.0 coulomb 3) 1.0 coulomb 4) 0.8 coulomb Answer: 2) 4.0 coulomb Solution: ε0 = dΦ/dt =... View Article
A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly
1) 2.5 × 10–7 weber 2) 6.31 × 10–6 weber 3) 5.2 × 10–5 weber 4) 4.1 × 10–5 weber... View Article
The direction of the induced current is such that it opposes the very cause that has produced it. This is the law of
1) Lenz 2) Faraday 3) Kirchhoff 4) Fleming Answer: 1) Lenz Solution: According to Lenz’s law, the direction of the induced... View Article
A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the e.m.f. induced in the wire is 2 V, the magnitude of the field in tesla is
1) 2 2) 5 3) 0.8 4) 2.5 Answer: 3) 0.8 Solution: When a wire of length l moves with a... View Article
The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 tesla to 6 tesla in 2 second. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is
1) 104 V 2) 1.2 V 3) 1.0 V 4) 10–2 V Answer: 3) 1.0 V Solution: e = – N(ΔB/Δt).Acosθ... View Article
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be
1) Horizontal 2) Vertical 3) Clockwise 4) Anticlockwise Answer: 4) Anticlockwise Solution: The direction of the induced current in the conducting... View Article
The rms value of ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be,
1) 2 x 10-2 sec and 14.14 amp 2) 1 x 10-2 sec and 7.07 amp 3) 5 x 10-3 sec and... View Article
An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mc. The resistance of the circuit is negligible. At the instant, the circuit is closed be t = 0. At what time is the energy stored completely magnetic
1) t = 0 2) t = 1.54 ms 3) t = 3.14 ms 4) t = 6.28 ms Answer:... View Article
In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance becomes….
1) 4 times 2) 2 times 3) 8 times 4) No change Answer: 1) 4 times Solution: The formula for self-inductance... View Article
A solenoid of 1.5 m long with an inner diameter of 4 cm has three layers of winding of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross-section of the solenoid is nearly…..
1) 2.5 x 10-7 wb 2) 6.31 x 10-6 wb 3) 2.1 x 10-6 wb 4) 4.1 x 10-5 wb... View Article
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. This is due to
1) diffraction of the signal received from the antenna 2) interference of the direct signal received by the antenna with... View Article
The self-inductance of a straight conductor is…
1) zero 2) very large 3) very small 4) ∞ Answer: zero Solution The self inductance of a straight conductor... View Article
Review Petition v/s Curative Petition v/s Mercy Petition
Review petition, curative petition and mercy petitions are the instruments available to an aggrieved party, to seek justice, on different... View Article
Find the square of 37.
Solution: To find the square of a number, we have to multiply the number by itself. For example, the square... View Article
Find the reciprocal of the following fraction 3/4.
Solution: A reciprocal means an expression which when multiplied by another expression, gives unity (1) as a result. Reciprocal of... View Article
Fill in the blanks with suitable reflexive or emphasizing pronouns:
The teacher advised the students to behave _________ during the program. She said that she ________ would be in trouble... View Article
The product of two coprime numbers is 117, then their LCM is
(a) 9 (b) 13 (c) 39 (d) 117 Solution: 117 = 13×9 Co-prime numbers are the numbers whose common factor... View Article
10% of 15% of 20% of Rs. 500 is
(a) 1.5 (b) 0.5 (c) 3.5 (d) 2.5 Solution: 20% of 500 = (20/100)500 = 100 15% of 20% of... View Article
Convert the following ratio into percentage. 22/30
Solution: To convert ratio into percentage, multiply the fraction by 100 and add the % symbol to the result. 22/30... View Article
