Physics-
General
Easy
Question
A current I flows in along straight wire with cross section having the form a half circular ring of radius R The magnetic field induction at the point O is
The correct answer is:
Related Questions to study
Physics-
An infinitely long wire is bent in the form of a semicircle at the end as shown in the figure. It carries current I along abcdo. If radius of the semicircle be R, then the magnetic field at 'O' which is the center of the circular part is,
An infinitely long wire is bent in the form of a semicircle at the end as shown in the figure. It carries current I along abcdo. If radius of the semicircle be R, then the magnetic field at 'O' which is the center of the circular part is,
Physics-General
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Two wires A and B are of lengths 40cm and 30cm. A is bent into a circle of radius r and B into an arc of radius r. A current 
is passed through A and 
through B. To have the same magnetic inductions at the centre, the ratio of 
is
Two wires A and B are of lengths 40cm and 30cm. A is bent into a circle of radius r and B into an arc of radius r. A current is passed through A and through B. To have the same magnetic inductions at the centre, the ratio of is
Physics-General
Physics-
Equal current 'i' flows in the two segments of a circular loop in the direction shown in fig. radius of the loop is 'a'. Magnetic field at the centre of the loop is,
Equal current 'i' flows in the two segments of a circular loop in the direction shown in fig. radius of the loop is 'a'. Magnetic field at the centre of the loop is,
Physics-General
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An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR. The magnetic field due to this current at the point M is 
. Now another infinitely long straight conductor QS is connected to Q so that the current is, 1/2 in QR as well as in QS, the current in PQ remaining unchanged. The magnetic field at M is now 
The ratio 
is given by
An infinitely long conductor PQR is bent to form a right angle as shown. A current I flows through PQR. The magnetic field due to this current at the point M is . Now another infinitely long straight conductor QS is connected to Q so that the current is, 1/2 in QR as well as in QS, the current in PQ remaining unchanged. The magnetic field at M is now The ratio is given by
Physics-General
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Two long parallel conductors carry currents 
and 
both are directed into the plane of paper. The magnitude of resultant magnetic field at point ' 
' is,
Two long parallel conductors carry currents and both are directed into the plane of paper. The magnitude of resultant magnetic field at point ' ' is,
Physics-General
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When 0.005A current flows through a moving coil galvanometer, it gives full scale deflection. It is converted into a voltmeter to read 5 Volt, using an external resistance of 
. The resistance of galvanometer in ohms is
When 0.005A current flows through a moving coil galvanometer, it gives full scale deflection. It is converted into a voltmeter to read 5 Volt, using an external resistance of . The resistance of galvanometer in ohms is
Physics-General
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The force exerted by the conductor AB on the loop CDFG shown in figure is
The force exerted by the conductor AB on the loop CDFG shown in figure is
Physics-General
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Three long straight and parallel wires, carrying currents are arranged as shown figure. The force experienced by the conductor 'B' of length 25cm is
Three long straight and parallel wires, carrying currents are arranged as shown figure. The force experienced by the conductor 'B' of length 25cm is
Physics-General
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Two particles A and B of mass 
and 
respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are 
and 
respectively, and the trajectories are as shown in the figure. Then
Two particles A and B of mass and respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are and respectively, and the trajectories are as shown in the figure. Then
Physics-General
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Two circular coils of radii 20cm and 30cm having number of turns 50 and 100 made of same material are connected in series. The ratio of the magnetic field of induction at their centres is
Two circular coils of radii 20cm and 30cm having number of turns 50 and 100 made of same material are connected in series. The ratio of the magnetic field of induction at their centres is
Physics-General
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In the circuit 
ohm and 
ohm. If the resistance of the voltmeter R=10,000ohm, voltmeter reading is
In the circuit ohm and ohm. If the resistance of the voltmeter R=10,000ohm, voltmeter reading is
Physics-General
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If in the circuit shown below. The internal resistance of the battery is 
and 
and 
are the potentials at P and Q respectively, the potential difference between the points P and Q is
If in the circuit shown below. The internal resistance of the battery is and and are the potentials at P and Q respectively, the potential difference between the points P and Q is
Physics-General
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Two cells of emf 
and 
are connected to two resistors 
and 
as shown. If is short circuited then currents through and are
Two cells of emf and are connected to two resistors and as shown. If is short circuited then currents through and are
Physics-General
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An aluminum 
wire resistance ' ' and carbon wire 
resistance ' ' are connected in series to have a resultant resistance of 18 ohm at all temperatures. The values of and in ohms
An aluminum wire resistance ' ' and carbon wire resistance ' ' are connected in series to have a resultant resistance of 18 ohm at all temperatures. The values of and in ohms
Physics-General
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In the steady state, the charge on the capacitor capacity 
is
In the steady state, the charge on the capacitor capacity is
Physics-General
