Physics-
General
Easy
Question
In given figure, a wire loop has been bent so that it has three segments: segment ab (a quarter circle), bc (a square corner), and ca (straight). Here are three choices for a magnetic field through the loop:
Where 
is in milliteslas and t is in seconds. If the induced current in the loop due to 
are 
respectively then
The correct answer is:
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Three wire loops and an observer are positioned as shown in the figure. From the observer's point of view, a current I flows counterclockwise in the middle loop, which is moving towards the observer with a velocity v. Loops A and B are stationary. This same observer would notice that
Three wire loops and an observer are positioned as shown in the figure. From the observer's point of view, a current I flows counterclockwise in the middle loop, which is moving towards the observer with a velocity v. Loops A and B are stationary. This same observer would notice that
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At t = 0 a charge q is at the origin and moving in the y-direction with velocity 
in a magnetic field that is for y > 0 out of page and given by 
into the page and given 
The charge's subsequent trajectory is shown in the sketch. From this information, we can deduce that
At t = 0 a charge q is at the origin and moving in the y-direction with velocity in a magnetic field that is for y > 0 out of page and given by into the page and given The charge's subsequent trajectory is shown in the sketch. From this information, we can deduce that
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A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are connected by another conducting rail as shown in the figure. There is a uniform magnetic field B pointing upward. Due to the bar's motion, there is an induced current in the bar-rail circuit. What is the direction of the magnetic force on the bar?
A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are connected by another conducting rail as shown in the figure. There is a uniform magnetic field B pointing upward. Due to the bar's motion, there is an induced current in the bar-rail circuit. What is the direction of the magnetic force on the bar?
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A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field directed into the paper. AO = l and OC = 3l. Then
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A capacitor of capacitance 0.1 
is connected to a battery of emf 8V as shown in the fig. Under steady state condition
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In the circuit shown in the figure, switches S1 and S2 have been closed for a long time
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In the circuit shown, the switch is shifted from position 
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In the circuit shown, the charge on the 3 capacitor at steady state will be
In the circuit shown, the charge on the 3 capacitor at steady state will be
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The figure below shows four parallel plate capacitors : A, B, C and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant k = 5.
The figure below shows four parallel plate capacitors : A, B, C and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant k = 5.
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The figure below shows four parallel plate capacitors : A, B, C and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant k = 5.
Which list below places the capacitors in order of increasing capacitance?
The figure below shows four parallel plate capacitors : A, B, C and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant k = 5.
Which list below places the capacitors in order of increasing capacitance?
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While measuring diameter of a wire using a screw gauge the main scale reading is 7mm and zero of circular scale is 35 divisions above the reference line. If the screw gauge has a zero error of -0.003cm , the correct diameter of the wire is (given least count = 0.001cm)
While measuring diameter of a wire using a screw gauge the main scale reading is 7mm and zero of circular scale is 35 divisions above the reference line. If the screw gauge has a zero error of -0.003cm , the correct diameter of the wire is (given least count = 0.001cm)
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The main scale of vernier callipers is divided into 0.5mm and its least count is 0.005cm. Then the number of divisions on vernier scale is
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The Vernier constant of a Vernier Callipers is
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Two identical capacitors 1 and 2 are connected in series. The capacitor 2 contains a dielectric slab of constant K as shown. They are connected to a battery of emf V0 volts. The dielectric slab is then removed. Let Q1 and Q2 be the charge stored in the capacitors before removing the slab and Q1 ¢, and Q2 ¢ be the values after removing the slab. Then
Two identical capacitors 1 and 2 are connected in series. The capacitor 2 contains a dielectric slab of constant K as shown. They are connected to a battery of emf V0 volts. The dielectric slab is then removed. Let Q1 and Q2 be the charge stored in the capacitors before removing the slab and Q1 ¢, and Q2 ¢ be the values after removing the slab. Then
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Three long conducting plate A, B & C having charges +q, –2q & +q as shown in figure. Here plate A and C are fixed. If the switch S is closed. The middle plate (B) will start moving in
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physics-General
