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401.	A uniformly wound long solenoid of inductance `L` and resistance `R` is cut into two parts in the ratio `eta:1`, which are then connected in parallel. The combination is then connected to a cell of emf `E`. The time constant of the circuit isA. `L//R`B. `L//2R`C. `2L/R`D. `L//4R`
Answer» Correct Answer - A

402.	When a coil is joined to a cell, the current through the cell grows with a tiem constant `tau`. The current will reach `10%` of its steady-state value of timeA. `0.1tau`B. `tau In (0.1)`C. `tauIn (0.9)`D. `tauIn (10-9)`
Answer» Correct Answer - D

403.	Two long thin wires ABC and DEF are arranged as shown in Fig. They carry equal currents I as shown. The magnitude of the magnetic field at O is A. zero only at the centre of the loopB. `(mu_(0)I)/(4pia)`C. `(mu_(0)I)/(2pia)`D. `(mu_(0)I)/(2sqrt(2)pia)`
Answer» Correct Answer - C

404.	In the current shown Fig., `X` is joined to `Y` for a long time and then `X` is joined to `Z`. The total heat produced in `R_(2)` is A. `(L varepsilon^(2))/(2R_(1)^(2))`B. `(Lvarepsilon^(2))/(2R_(2)^(2))`C. `(Lvarepsilon^(2))/(2R_(1)R_(2))`D. `(Lvarepsilon^(2)R_(2))/(2R_(1)^(3))`
Answer» Correct Answer - A

405.	In the circuit shown in fig.. Time constant and steady state current will be A. `0.25 s, 0.75 A`B. `0.75 s, 0.25 A`C. `0.25 s, 0.25 A`D. `0.5 s, 0.5 A`
Answer» Correct Answer - A

406.	In the circuit shows in Fig, the coil has inductance and resistance. When `X` is joined to `Y`, the time constant is `tau` during the growth of current. When the steady state is reached, heat is produced in the coil at a rate `P`. `X` is now joined to `Z`. After joining `X` and `Z`: A. The total heal produced in the coil is `P tau`B. The total heat producd in the coil is `1/2 Ptau`C. The total heat produced in the coil is `2Ptau`D. The data given is not sufficeint to reach a conclusion
Answer» Correct Answer - B

407.	If fig. the difference of potential between (B) and (D) is - A. `+ 0.67 V`B. `-0.67V`C. `2V`D. `1.33V`
Answer» Correct Answer - C

408.	A wire of resistance `0.5 omega m^(-1)` is bent into a circle of radius `1m`. The same wire is connected across a diameter `AB` as shown in fig. The equivalent resistance is A. `pi ohm`B. `(pi)/((pi + 2)) ohm`C. `(pi)/((pi + 4)) ohm`D. `(pi + 1) ohm`
Answer» Correct Answer - C

409.	The current -voltage - variation for a wire of copper of length (L) and area (A) is shown in fig. The slope of the line will be A. less if experiment is done at a heigher temperatureB. more if a wire of silver of same dimension is usedC. will be doubled if the lengths of the wire is doubledD. will be halved if the length is doubled
Answer» Correct Answer - C

410.	The variation of electric potential with distance from a fixed point is shown in figure. What is the value of electric field at `x = 2m` - A. ZeroB. `6//2`C. `6//1`D. `6//3`
Answer» Correct Answer - A

411.	Two point charges repel each other with a force of 100N. One of the charges is increased is increased by 10% and the other is reduced by 10% . The new force of repulsion at the same distance would beA. `100 N`B. `21 N`C. `99 N`D. None of these
Answer» Correct Answer - C

412.	The electric flux from a cube of edge l is `phi`. If an edge of the cube is made `2l` and the charge enclosed is halved, its value will beA. `phi//2`B. `2phi`C. `4phi`D. `phi`
Answer» Correct Answer - A

413.	A thin semicircular conducting ring of radius `R` is falling with its plane verticle in a horizontal magnetic inducting `B`. At the position `MNQ`, the speed of the ring is `V` and the potential difference developed across the ring is A. zeroB. `1/2BvpiR^(2)`, and `M` is at a higher potentialC. `piRBv`, and `Q` is at a higher potentialD. `2RBv`, and `Q` is at a higher potential
Answer» Correct Answer - D

414.	Statement X: When electric current flows vertically upwards the direction of the magnetic field lines produced by a straight conductor are in anti clock wise direction. Statement Y : When electric current flows vertically down-wards the direction of the magnetic field lines produced by a straight conductor are in clock wise direction. A) Both statements are trueB) Both statements are false C) X is true, Y is false D) X is false, Y is true
Answer» A) Both statements are true

415.	Does it (continuous rotation of coil) help us to generate electric current?
Answer» Yes. Continuous rotation of coil helps us to generate electric current.

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